https://vital.seals.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 Phthalocyanine-nanoparticle conjugates supported on inorganic nanofibers as photocatalysts for the treatment of biological and organic pollutants as well as for hydrogen generation https://vital.seals.ac.za/vital/access/manager/Repository/vital:45268 Wed 16 Mar 2022 10:18:30 SAST ]]> Photophysical and photoelectrochemical properties of water soluble metallophthalocyanines https://vital.seals.ac.za/vital/access/manager/Repository/vital:4330 Wed 12 May 2021 23:40:38 SAST ]]> Synthesis, photochemical and photophysical properties of gallium and indium phthalocyanine derivatives https://vital.seals.ac.za/vital/access/manager/Repository/vital:4375 Wed 12 May 2021 23:20:49 SAST ]]> Electrochemical studies of titanium, manganese and cobalt phthalocyanines https://vital.seals.ac.za/vital/access/manager/Repository/vital:4312 Wed 12 May 2021 23:20:08 SAST ]]> Nonlinear optical properties of Sn(IV) phthalocyanines: experimental and theoretical approach https://vital.seals.ac.za/vital/access/manager/Repository/vital:26996 Wed 12 May 2021 22:53:00 SAST ]]> Photophysical studies of zinc and indium tetraaminophthalocyanines in the presence of CdTe quantum dots https://vital.seals.ac.za/vital/access/manager/Repository/vital:4332 Wed 12 May 2021 20:25:51 SAST ]]> Nonlinear optical responses of phthalocyanines in the presence of nanomaterials or when embedded in polymeric materials https://vital.seals.ac.za/vital/access/manager/Repository/vital:25548 Wed 12 May 2021 20:07:23 SAST ]]> Photophysicochemical properties of aluminium phthalocyanine-platinum conjugates https://vital.seals.ac.za/vital/access/manager/Repository/vital:4285 Wed 12 May 2021 19:56:19 SAST ]]> Nonlinear optical responses of targeted phthalocyanines when conjugated with nanomaterials or fabricated into polymer thin films https://vital.seals.ac.za/vital/access/manager/Repository/vital:29926 Wed 12 May 2021 19:50:04 SAST ]]> Photosensitizing properties of non-transition metal porphyrazines towards the generation of singlet oxygen https://vital.seals.ac.za/vital/access/manager/Repository/vital:4395 Wed 12 May 2021 19:42:10 SAST ]]> Symmetry and asymmetry in electrocatalysis: enhancing the electrocatalytic activity of phthalocyanines through synergy with doped graphene quantum dots https://vital.seals.ac.za/vital/access/manager/Repository/vital:34529 Wed 12 May 2021 19:30:43 SAST ]]> Study of metallophthalocyanines attached onto pre-modified gold surfaces https://vital.seals.ac.za/vital/access/manager/Repository/vital:4361 Wed 12 May 2021 19:18:40 SAST ]]> Photophysicochemical properties and surface-enhanced Raman scattering of phthalocyanine-nanoparticle conjugates https://vital.seals.ac.za/vital/access/manager/Repository/vital:29928 Wed 12 May 2021 19:14:28 SAST ]]> Synthesis of indium phthalocyanines for photodynamic antimicrobial chemotherapy and photo-oxidation of pollutants https://vital.seals.ac.za/vital/access/manager/Repository/vital:29116 Wed 12 May 2021 19:14:06 SAST ]]> Synthesis, photophysics and electrochemical study of tin macrocycles https://vital.seals.ac.za/vital/access/manager/Repository/vital:4376 Wed 12 May 2021 19:11:10 SAST ]]> Phthalocyanine-nanoparticle conjugates for photodynamic therapy of cancer and phototransformation of organic pollutants https://vital.seals.ac.za/vital/access/manager/Repository/vital:4538 Wed 12 May 2021 19:02:23 SAST ]]> Photo-physicochemical studies and photodynamic therapy activity of indium and gallium phthalocyanines https://vital.seals.ac.za/vital/access/manager/Repository/vital:4548 Wed 12 May 2021 18:32:45 SAST ]]> Syntheses and photophysico-chemical properties of phthalocyanines in the presence of silica nanoparticles https://vital.seals.ac.za/vital/access/manager/Repository/vital:29118 Wed 12 May 2021 18:23:20 SAST ]]> Photophysical studies of Zinc phthalocyanine-silica nanoparticles conjugates https://vital.seals.ac.za/vital/access/manager/Repository/vital:4537 Wed 12 May 2021 17:56:16 SAST ]]> The photophysical properties of low symmetry phthalocyanines in conjunction with quantum dots https://vital.seals.ac.za/vital/access/manager/Repository/vital:4331 Wed 12 May 2021 17:29:37 SAST ]]> Characterization and application of phthalocyanine-gold nanoparticle conjugates https://vital.seals.ac.za/vital/access/manager/Repository/vital:4293 Wed 12 May 2021 17:24:17 SAST ]]> Nonlinear optical studies of phthalocyanines and their conjugates with nanomaterials https://vital.seals.ac.za/vital/access/manager/Repository/vital:4545 Wed 12 May 2021 17:12:36 SAST ]]> Photophysical properties of zinc carboxy phthalocyanine-quantum dot conjugates https://vital.seals.ac.za/vital/access/manager/Repository/vital:4276 Wed 12 May 2021 16:06:38 SAST ]]> Photophysical properties and photodynamic therapy activities of symmetrical and asymmetrical porphyrins embedded into Pluronic polymer micelles and nonlinear optical properties of an asymmetrical phthalocyanine https://vital.seals.ac.za/vital/access/manager/Repository/vital:29122 90% cell survival. The photodynamic activity of water insoluble porphyrins improved when encapsulated into the micelles. Novel asymmetrical phthalocyanines were also synthesised for nonlinear optics (NLO) studies in solution and thin films.]]> Wed 12 May 2021 16:05:57 SAST ]]> Determination of nonlinear optical properties of phthalocyanine regioisomers using computational models https://vital.seals.ac.za/vital/access/manager/Repository/vital:41337 Wed 12 May 2021 15:02:23 SAST ]]> The electrocatalytic response of metallophthalocyanines when clicked to electrodes and to nanomaterials https://vital.seals.ac.za/vital/access/manager/Repository/vital:42174 Wed 12 May 2021 15:00:21 SAST ]]> Synthesis, photophysicochemical properties and photodynamic therapy activities of indium and zinc phthalocyanines when incorporated into Pluronic polymer micelles https://vital.seals.ac.za/vital/access/manager/Repository/vital:41489 50% cell viability) at concentrations ≤100 μg/mL, however the conjugates showed < 45% cell viability at concentrations ≤ 100 μg/mL, probably due to the small micellar size and EPR effect. The findings from this work show the importance of incorporating photosensitizers such as phthalocyanines into Pluronic polymers micelles and making them water soluble and ultimately improving their photodynamic effect.]]> Wed 12 May 2021 14:58:28 SAST ]]> Metallophthalocyanines linked to metal nanoparticles and folic acid for use in photodynamic therapy of cancer and photoinactivation of bacterial microorganisms. https://vital.seals.ac.za/vital/access/manager/Repository/vital:41377 Wed 12 May 2021 14:34:09 SAST ]]> Evaluation of metallophthalocyanine functionalized photocatalytic asymmetric polymer membranes for pollution control and antimicrobial activity https://vital.seals.ac.za/vital/access/manager/Repository/vital:42052 Wed 12 May 2021 14:30:41 SAST ]]> Development of graphene materials and phthalocyanines for application in dye-sensitized solar cells https://vital.seals.ac.za/vital/access/manager/Repository/vital:41328 Wed 12 May 2021 14:19:36 SAST ]]> Photocatalysis of 4-chloro and 4-nonylphenols using novel symmetric phthalocyanines and asymmetric porphyrin supported on polyacrylonitrite nanofibres https://vital.seals.ac.za/vital/access/manager/Repository/vital:41163 Wed 12 May 2021 13:49:36 SAST ]]> Synthesis, spectroscopic and nonlinear optical properties of asymmetric A3B type phthalocyanine complexes https://vital.seals.ac.za/vital/access/manager/Repository/vital:42108 3.76 × 10 − 10 ( 4a ) > 3.52 × 10 − 10 ( 4c ) > 2.29 × 10 − 10 ( 3c ) > 1.68 × 10 − 10 ( 3a ) > 1.65 × 10 − 10 ( 3b ) mW - 1 . The 휷 values trend of synthesized Pc complexes show that the asymmetrical A 3 B type metal free, cobalt and zinc Pc complexes ( 4a , 4b and 4c ) have larger 휷 values as compared to the octa - substituted symmetrical metal free, cobalt and zinc Pc complexes ( 3a , 3b and 3c ) which is attributed to the low symmetry of the Pc complexes. The five - level model rate equations were used to determine the two photon absorption, excited state absorption and ground state absorption cross sections of the synthesized complexes. The z inc A 3 B type asymmetrical Pc complexes gave the largest two photon absorption and 휎 푒 / 휎 푔 ratio values. This Pc complex could be used in future work to enhance the nonlinear response further by introducing nanomaterials and converting the Pc complex to a binuclear Pc. This work also reports on the density functional theory (DFT) calculations o f dipolar/octupolar contributions in order to study the first order hyperpolarizability of the synthesized Pc complexes.]]> Wed 12 May 2021 13:45:11 SAST ]]> Inhibition of aluminium corrosion using phthalocyanines: Experimental and computational studies https://vital.seals.ac.za/vital/access/manager/Repository/vital:57240 Tue 25 Oct 2022 12:53:00 SAST ]]> Tetra 4-(propargyloxy)phenoxy phthalocyanines: synthesis, spectroscopic, nonlinear optical and electrocatalytic properties https://vital.seals.ac.za/vital/access/manager/Repository/vital:28695 CoTPrOPhOPc > MnTPrOPhOPc. According to the trend observed, the H2TPrOPhOPc was an excellent nonlinear optical limiter when compared to the CoTPrOPhOPc and MnTPrOPhOPc. All the investigated complexes exhibited optical limiting properties comparable to the phthalocyanine complexes reported in the literature. The MTPrOPhOPc complexes were further studied for their electrocatalytic and electroanalytical properties towards the detection of hydrogen peroxide. For the electrocatalytic studies, the synthesized complexes were immobilized onto gold electrode surfaces pre-functionalized with phenylazide (Au-PAz) monolayer. Copper (I) catalyzed alkynyl-azide cycloaddition reaction was used to covalently immobilize the MTPrOPhOPcs onto the gold electrode surfaces to form Au-PAz-MTPrOPhOPc. The MTPrOPhOPcs modified gold surfaces (Au-PAz-MTPrOPhOPc) exhibited good reproducibility and stability in various electrolyte conditions. Electrochemical and surface characterisation of the functionalised gold electrode surfaces confirmed the presence of the MTPrOPhOPcs and their electroanalysis was excellent towards electrocatalytic reduction of H2O2, with the limit of detection (LoD) and limit of quantification (LoQ) in the ^M range. The electrocatalytic reduction peaks for H2O2 were observed at -0.37 V for Au-PAz-MnTPrOPhOPc and -0.31 V for Au-PAz-CoTPrOPhOPc when Ag|AgCl pseudo-reference electrode was used. The Au-PAz-MnTPrOPhOPc and Au- PAz-CoTPrOPhOPc gold electrode surfaces showed good sensitivity and reproducibility towards the electrocatalytic reduction of hydrogen peroxide in pH 7.4 phosphate buffer solution.]]> Thu 20 Apr 2023 09:37:14 SAST ]]> Nonlinear optical properties of metal free thio alkyl and tert-butyl phenoxy phthalocyanine https://vital.seals.ac.za/vital/access/manager/Repository/vital:45021 1.21×10−32(C4h) > 1.05×10−32 (C2v) esu, respectively, in chloroform. Symmetry was seen to have an effect on the observed reverse saturable absorption (RSA) response. Based on the five level model rate equation nonlinear fit of the RSA response curves and Real Time Time Dependant Density Functional Theory (RT-TDDFT) results, the singlet excited state population dynamics was found to play a significant role in producing the observed Im[γ] trend.]]> Thu 17 Feb 2022 15:40:47 SAST ]]> Functionalized Ru(II) polypyridines and phthalocyanines: Potential dyes for dye-sensitized solar cells(DSSCs) https://vital.seals.ac.za/vital/access/manager/Repository/vital:62638 Thu 16 Mar 2023 16:15:52 SAST ]]> Photocatalytic treatment of organic and inorganic water pollutants using zinc phthalocyanine-cobalt ferrite magnetic nanoparticle conjugates https://vital.seals.ac.za/vital/access/manager/Repository/vital:29119 Thu 13 May 2021 16:04:33 SAST ]]> Effects of Axial Ligands on the Photosensitising Properties of Silicon Octaphenoxyphthalocyanines https://vital.seals.ac.za/vital/access/manager/Repository/vital:4553 600 nm) in dimethylsulphoxide solution. All the ligands were transformed into the dihydroxy silicon octaphenoxyphthalocyanine with varying degrees of phototransformation quantum yields ranging in order from 10⁻³ to 10⁻⁵ depending on the axial ligand involved. During and after axial ligand transformations a photodegredation of the dihydroxy silicon octaphenoxy phthalocyanine was observed upon continued irradiation. The oligomers were found to undergo the same axial ligand transformation process with a phototransformation quantum yield of 10⁻⁵ The singlet oxygen quantum yields of the unaggregated monomeric silicon octaphenoxy phthalocyanines were all found to be approximately 0.2 with the exception of a compound with two (trihexyl)siloxy axial substituents that had a singlet oxygen quantum yield of approximately 0.4 in dimethylsulphoxide solutions. The oligomers showed a surprising trend of an increase in singlet oxygen quantum yield with an increase in phthalocyanine ring number up to the pentamer and then a dramatic decrease to the nonamer. The triplet quantum yield and triplet lifetime were determined by laser flash photolysis for selected compounds and no correlation was observed with any of these properties and the singlet oxygen quantum yields. These selected compounds all fluoresce and a very good correlation was found between the fluorescence lifetimes determined experimentally by laser photolysis and the Strickler-Berg equation for the non-aggregated compounds. Electrochemical measurements also indicate the importance of the axial ligands upon the behaviour of the phthalocyanines as cyclic voltammetric behaviour was determined by the nature of the axial ligand.]]> Thu 13 May 2021 14:52:35 SAST ]]> Effect of substituents on the photophysical properties and nonlinear optical properties of asymmetrical zinc(II) phthalocyanine when conjugated to semiconductor quantum dots https://vital.seals.ac.za/vital/access/manager/Repository/vital:31404 Thu 13 May 2021 12:43:26 SAST ]]> Metallophthalocyanine-gold nanoparticle conjugates for photodynamic antimicrobial chemotherapy https://vital.seals.ac.za/vital/access/manager/Repository/vital:4543 Thu 13 May 2021 11:46:40 SAST ]]> Physicochemical properties and photodynamic therapy activities of indium and zinc phthalocyanine-nanoparticle conjugates https://vital.seals.ac.za/vital/access/manager/Repository/vital:30589 50Îll viability at concentrations≤ 160μg/mL, however the conjugates showed<50% cell viabilityatconcentrations≤ 160μg/mLprobably due to the enhanced singlet oxygen quantum yield. The findings from this work show the importance of linking photosensitises such as phthalocyanines to metal nanoparticles for the enhancement ofsinglet oxygen quantum yield and ultimately the photodynamic effect.]]> Thu 13 May 2021 08:10:17 SAST ]]> Low symmetry metallophthalocyanines and their nanoparticle conjugates for photodynamic antimicrobial chemotherapy https://vital.seals.ac.za/vital/access/manager/Repository/vital:4278 Thu 13 May 2021 07:14:17 SAST ]]> Electrode surface modification using metallophthalocyanines and metal nanoparticles : electrocatalytic activity https://vital.seals.ac.za/vital/access/manager/Repository/vital:4541 Thu 13 May 2021 07:06:37 SAST ]]> Effect of the nature of nanoparticles on the photophysicochemical properties and photodynamic antimicrobial chemotherapy of phthalocyanines https://vital.seals.ac.za/vital/access/manager/Repository/vital:35406 Thu 13 May 2021 06:50:34 SAST ]]> Effects of substituents on the photosensitizing and electrocatalytic properties of phthalocyanines https://vital.seals.ac.za/vital/access/manager/Repository/vital:4554 SnPc>ZnPc. Triplet lifetimes of the GePc (168-340μs) are very similar to that of the ZnPc (197 - 366μs), but the triplet lifetimes of the SnPc are ten fold shorter (10 - 32μs ). Triplet quantum yields are higher for the GePc (0.20 - 0.50) and SnPc (0.08 - 0.45) than for the ZnPc (0.02 - 0.25). Fluorescence lifetimes of GePc ( 4.0 - 5.1 ns) are significantly longer than that of ZnPc (1.9 - 3.0 ns) and SnPc (0.2 - 0.4 ns). Fluorescence quantum yields decrease in the following order: GePc(0.21-0.31)>ZnPc(0.02-0.21)>SnPc(0.02- 0.06). Ring-substituted cobalt phthalocyanine complexes of the form CoPc(R)4 (R= NH2, N02, C(CH3)3, S03H and COOH) are compared for their catalytic activities towards the oxidation of cysteine. The potential for the electrocatalytic oxidation of cysteine is closely related to the Com/Co11 couple of the CoPc(R)4 complexes in acidic media and to the Con/Co1 couple in basic media. The catalytic current and the oxidation potential for cysteine are dependent on the pH of the solution, the potential becoming less positive and the currents increasing with increase in pH.]]> Thu 13 May 2021 06:41:11 SAST ]]> Electrochemical sensing and immunosensing using metallophthalocyanines and biomolecular modified surfaces https://vital.seals.ac.za/vital/access/manager/Repository/vital:5580 Thu 13 May 2021 06:37:27 SAST ]]> Synthesis and photophysical properties of antimony and lead phthalocyanines https://vital.seals.ac.za/vital/access/manager/Repository/vital:4370 Thu 13 May 2021 04:48:05 SAST ]]> Photodynamic antimicrobial chemotherapy activities of porphyrin- and phthalocyanine-platinum nanoparticle conjugates https://vital.seals.ac.za/vital/access/manager/Repository/vital:4539 Thu 13 May 2021 04:42:43 SAST ]]> Removal and photocatalysis of 4-Nitrophenol using metallophthalocyanines https://vital.seals.ac.za/vital/access/manager/Repository/vital:4343 NiPcS[subscript 4] > NiPcS[subscript mix] > FePcS[subscript 4] > FePcS[subscript mix] > CoPcS[subscript 4]. The adsorbents were regenerated using dilute HNO[subscript 3], with 76 % (7.6 x 10[superscript -5] mol) of 4-Np recovered within 150 min.]]> Thu 13 May 2021 04:14:52 SAST ]]> Synthesis of zinc phthalocyanine derivatives for possible use in photodynamic therapy https://vital.seals.ac.za/vital/access/manager/Repository/vital:4374 Thu 13 May 2021 03:57:29 SAST ]]> Photophysicochemical properties and in vitro photodynamic therapy activities of zinc phthalocyanine conjugates with biomolecules and single-walled carbon nanotubes https://vital.seals.ac.za/vital/access/manager/Repository/vital:4544 Thu 13 May 2021 03:36:01 SAST ]]> Nonlinear optical studies of phthalocyanines and triazatetrabenzcorroles in solution and in thin films https://vital.seals.ac.za/vital/access/manager/Repository/vital:4542 Thu 13 May 2021 03:30:48 SAST ]]> Substituent effects on the electrocatalytic activity of cobalt phthalocyanine in the presence of graphene quantum dots https://vital.seals.ac.za/vital/access/manager/Repository/vital:29121 Thu 13 May 2021 01:46:43 SAST ]]> Photophysicochemical and photodynamic antimicrobial chemotherapeutic studies of novel phthalocyanines conjugated to silver nanoparticles https://vital.seals.ac.za/vital/access/manager/Repository/vital:4291 Thu 13 May 2021 01:46:25 SAST ]]> Graphene quantum dots and their metallophthalocyanines nanoconjugates as novel photoluminescent nanosensors https://vital.seals.ac.za/vital/access/manager/Repository/vital:27821 Thu 13 May 2021 01:17:53 SAST ]]> Photophysicochemical studies of phenylthio phthalocyanines interaction with gold nanoparticles and applications in dye sensitised solar cells and optical limiting https://vital.seals.ac.za/vital/access/manager/Repository/vital:4334 Thu 13 May 2021 01:17:13 SAST ]]> Substituted phthalocyanines development and self-assembled monolayer sensor studies https://vital.seals.ac.za/vital/access/manager/Repository/vital:4364 Thu 13 May 2021 01:03:21 SAST ]]> Synthesis, photochemical and photophysical properties of phthalocyanine derivatives https://vital.seals.ac.za/vital/access/manager/Repository/vital:4436 67 > 66. Comparing porphyrazine complexes (63, 64 and 65), 63 with benzene attached to the ring, has higher triplet state lifetime (420 μs) compared to 64 and 65 containing long alkyl chain and tertbutyl substituents, 350 and 360 μs,respectively). The observed Φ[subscript]f values for 68 and 63 were quiet suprising, since low values are observed compared to the rest of the complexes (e.g 0.03 and 0.02 respectively). Although these values seem so low, they are sufficient for fluorescence imaging applications. The Φ[subscript]f values for the complexes under study are within the range reported for complexes currently used for PDT.]]> Thu 13 May 2021 00:21:54 SAST ]]> Design of pH Sensitive Electrochemical Sensor for Catecholamine Neurotransmitters Detection and the Screening Off of Ascorbic Acid https://vital.seals.ac.za/vital/access/manager/Repository/vital:42772 Sun 14 Nov 2021 09:23:22 SAST ]]> Singlet oxygen and optical limiting applications of BODIPYs and other molecular dyes https://vital.seals.ac.za/vital/access/manager/Repository/vital:57238 Mon 24 Oct 2022 15:47:54 SAST ]]> The construction of phthalocyanine- carbon nanoparticle conjugates for applications in photodynamic therapy and non-linear optics https://vital.seals.ac.za/vital/access/manager/Repository/vital:44750 22% cell viability at concentrations ≤ 50 μg/mL relative to conjugates with <22% cell viability at concentrations ≤ 50 μg/mL. There was no direct relationship between PDT and singlet oxygen quantum yields. Nonlinear optical characteristics of complexes was improved upon conjugation of DNDs. Absorbance, input energy, percentage loading, central metal, substituent of Pc and nature of interaction (covalent, noncovalent) are amongst some of the factors that influence nonlinear absorption properties of materials used in this study. All materials followed reverse saturable absorption through two photon absorption mechanism at the excitation wavelength of 532 nm. Aggregates reduce excited state lifetime and Beff under high concentrations/absorbance. A direct relationship between absorbance and Beff of DNDs nanoconjugated systems at low concentrations result in increased optical limiting characteristics of materials. The findings from this work show the importance of linking (nonlinear optics and photodynamic therapy) and doping (photodynamic therapy) photosensitisers such as phthalocyanines and sometimes boron dipyrromethenes onto carbon based nanoparticles for the enhanced characteristics in variable applications.]]> Mon 15 Nov 2021 16:13:10 SAST ]]> The systematic assembly of prostate specific antigen electrochemical sensors based on asymmetric Co(II) phthalocyanines, graphitic quantum dots and an aptamer https://vital.seals.ac.za/vital/access/manager/Repository/vital:50035 Mon 10 Oct 2022 08:41:01 SAST ]]> Characterisation of surfaces modified with phthalocyanines through click chemistry for applications in electrochemical sensing https://vital.seals.ac.za/vital/access/manager/Repository/vital:27038 Fri 17 Sep 2021 10:11:50 SAST ]]> Functionalized Ru(II) polypyridines and phthalocyanines: Potential dyes for dye-sensitized solar cells(DSSCs) https://vital.seals.ac.za/vital/access/manager/Repository/vital:62645 Fri 17 Mar 2023 12:59:52 SAST ]]>