Functionalized cobalt porphyrin immobilized multiwalled carbon nanotubes are synthesized and characterized. These new materials efficiently electrocatalyze oxygen reduction they have potential to replace conventional Pt–C catalyst in fuel cells.

Two π-extended nonplanar cobalt porphyrins embedded MWCNTs manifested efficient electrocatalysts for selective ORR under ambient conditions with excellent methanol tolerance and high stability due to effective π–π interactions.

Meso -β, β–β′ trifused porphyrins have been synthesized and exhibited nonplanar conformation with a high dipole moment values. Femtosecond third-order NLO measurements demonstrated promising 3PA coefficients cross-section

To examine the influence of mixed substituents on structural, electrochemical redox behavior porphyrins, two new classes beta-pyrrole substituted free-base tetraphenylporphyrins H2(TPP(Ph)4X4) (X = CH3, H, Br, Cl, CN) and H2(TPP(CH3)4X4) Ph, their metal (M Ni(II), Cu(II), Zn(II)) complexes have been synthesized effectively using modified Suzuki cross-coupling reactions. Optical absorption spectra these porphyrins showed significant red-shift with variation X in H2(TPPR4X4), they induce a...

Two new families of porphyrins with mixed substituent pattern, viz. 2-nitro-12,13-disubstituted-meso-tetraphenylporphyrins (H2TPP(NO2)X2, X = Ph, phenylethynyl (PE), 2-thienyl (Th), Br, and CN) 2-nitro-7,8,12,13,17,18-hexasubstituted-meso-tetraphenylporphyrins (H2TPP(NO2)X6, PE, Th), their metal (Co(II), Ni(II), Cu(II), Zn(II)) complexes have been synthesized characterized. H2TPP(NO2)X6 exhibited remarkable red shift in the Soret band (45–70 nm) longest wavelength band, Qx(0,0) (65–90 nm),...

Two new meso-substituted oxido-molybdenum corroles were synthesized and characterized by various spectroscopic techniques. In the thermogram, MoO[TTC] (1) exhibited excellent thermal stability up to 491 °C while MoO[TNPC] (2) good 318 °C. The oxidation states of molybdenum(V) verified electron paramagnetic resonance (EPR) spectroscopy an axial compression with dxy1 configuration. Oxido-molybdenum(V) complexes utilized for selective epoxidation olefins high TOF values (2066-3287 h-1) in...

New types of porphyrin-based framework solids were constructed by reacting meso-tetra(3-carboxyphenyl)porphyrin and meso-tetra(4-carboxyphenyl)metalloporphyrins with common salts lanthanide metal ions. The large size, high coordination numbers strong affinity for oxo ligands the latter, combined favorable hydrothermal reaction conditions, allowed formation open three-dimensional single-framework architectures polymerization, in which tetradentate porphyrin units are intercoordinated...

A series of cobalt porphyrins with π-extending or highly electron-withdrawing β-pyrrole substituents were investigated as to their electrochemistry, spectroscopic properties, and reactivity after electroreduction electroxidation in nonaqueous media. Each porphyrin, represented PorCo (where Por = TPP(NO2)Y2 TPP(NO2)Y6 Y phenyl, phenylethynyl, Br, CN) was shown undergo multiple redox reactions involving the conjugated π-ring system central metal ion which could exist a Co(III), Co(II), Co(I)...

β-Dicyanovinyl substituted porphyrins have been synthesized and utilized as chemodosimeters for ratiometric colorimetric sensing of cyanide ions in CH₃CN H₂O/CH₃CN mixture.

Octamethoxy vanadylporphyrin (<bold>1</bold>) and its perbromo derivative (<bold>2</bold>) have been synthesized. <bold>2</bold> exhibited 100% selectivity for epoxide formation with very high TOF numbers. Remarkably, biomimics vanadium bromoperoxidase (VBrPO) enzyme extremely value in water.

Two new series of β-triphenylamine-appended porphyrins (MTPP(TPA)2X, (where M = 2H, Co(ii), Ni(ii), Cu(ii), Zn(ii) and X NO2/CHO) have been synthesized characterized by various spectroscopic techniques, namely, UV-vis, fluorescence, NMR spectroscopy, mass spectrometry, cyclic voltammetry, density functional theory ultrafast nonlinear optical (NLO) studies. They exhibited 16-22 nm 39-58 red-shifts in the Soret Qx(0,0) bands, respectively, as compared to MTPPs due resonance inductive effects...

Two new series of unsymmetrically β-functionalized porphyrins, MTPP(NO2)MA (1M), (MA = methyl acrylate) and MTPP(NO2)MB (2M) (MB mono-benzo) (where M 2H, Co(II), Ni(II), Cu(II) Zn(II)), were synthesized characterized by various spectroscopic techniques. The saddle shape conformation ZnTPP(NO2)MAPy ZnTPP(NO2)MB was confirmed single-crystal X-ray analysis. Density functional theory (DFT) calculation revealed that NiTPP(NO2)MB has a severe nonplanar geometry possessing high magnitude ΔCβ ±0.727...

Complex 2,3,12,13-tetracyano-5,10,15,20-tetraphenylporphyrinatooxidovanadium(IV) {[VIVOTPP(CN)4], 2} has been prepared by nucleophilic substitution of β-bromo groups the corresponding 2,3,12,13-tetrabromo-5,10,15,20-tetraphenylporphyrinatooxidovanadium(IV) {[VIVOTPP(Br)4], 1} using CuCN in quinoline. Both complexes show biomimetic catalytic activity similar to enzyme haloperoxidases and efficiently brominate various phenol derivatives presence KBr, H2O2, HClO4 aqueous medium. Between these...

Optical nonlinearities of discrete absorption energy levels one the typical heterocyclic aromatic molecules, free-base porphyrins, have been probed over a broad spectral region (400–1600 nm) utilizing intense femtosecond pulses. A wide range strong one- and multiphoton-induced nonlinear absorptions both blue-end Soret (B) band (au → b1g) red-end orbital mixing split quasi-allowed Q-bands (Qx(0,0; 0,1), Qy(0,0; au eg) are critically reported. During resonant excitation within B- (400 (600–750...

β-Heptasubstituted porphyrins [MTPP(NO

Binuclear vanadyl(IV) porphyrin (V2BP), where two vanadium(IV) macrocycles are linked through benzimidazole units at the β-positions, has been prepared and characterized with various techniques, such as UV–vis, Fourier transform-infrared, electron paramagnetic resonance, cyclic voltammetry, density functional transform calculations, mass spectrometry. V2BP exhibits a red shift (Δλmax = 10 nm) in Soret band compared unsubstituted parent meso-tetraphenylporphyrin (VP). The synthesized...

To rival commercial organic electrolytes, it is important to focus on safe, cheap aqueous electrolytes with lower salt concentration (≈5.0 m) and a wider electrochemical stable potential window (ESPW). This study reports the facile synthesis of porphyrin-based covalent polymers (PTZ-COP, CBZ-COP, TPA-COP) through one-pot aromatic electrophilic polycondensation reaction between pyrrole monomeric aldehydes (PTZ-CHO, CBZ-CHO TPA-CHO). enhance conductivity, these (COPs) were noncovalently...

Two series of β-cyano-substituted porphyrins, MTPP(CN)X (where M = 2H, Co(II), Ni(II), Cu(II), and Zn(II) X 1 or 2), were synthesized thoroughly characterized using UV-visible, fluorescence, NMR spectroscopic techniques, mass spectrometry, cyclic voltammetry. One the investigated compounds, CuTPP(CN)2 (2-Cu), was structurally single crystal X-ray diffraction, its saddle-shape macrocyclic conformation revealed. Compared to MTPPs, these compounds showed red-shifts 7-24 nm 13-46 in Soret...

The development of efficient nanozymes for biomedical applications has garnered significant attention due to their exceptional stability and ease storage, offering a compelling alternative natural enzymes, which are...

Targeted synthesis of framework coordination polymers was achieved by reacting meso-tetra(4-carboxyphenyl)porphyrin with common salts lanthanide metal ions. The large size, high numbers and strong affinity for oxo ligands the latter, combined favourable hydrothermal reaction conditions in acidic environments, allowed formation open three-dimensional single-framework architectures which tetra-dentate porphyrin units are inter-coordinated multinuclear assemblies bridging ions, serve as...

We have synthesized 2,3,7,8,12,13,17,18-octachloro-meso-tetraphenylporphyrinatooxidovanadium(iv) (VOTPPCl8) and characterized by various spectroscopic (UV-Vis, IR EPR) techniques, MALDI-TOF mass spectrometry elemental analysis. The DFT optimized structure of VOTPPCl8 in CH3CN exhibited a highly nonplanar saddle shape conformation the porphyrin macrocycle. cyclic voltammogram showed 500 mV anodic shift first ring reduction potential 220 oxidation compared to VOTPP indicating electron...