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• 14074-80-7 zinc 5,10,15,20-tetraphenylporphyrin 
• 917-23-7 5,15,10,20-tetraphenylporphyrin 

Relevant academic research and scientific papers

Porphyrin/MgCl2/silica gel composite as a cobalt-free humidity indicator

In order to develop cobalt-free humidity indicator, the composite consisted of porphyrin, MgCb, and silica gel was prepared. The composite exhibited a reversible color change from green to purple under dry and humid conditions, respectively. Copyright

Acid dissociation of (5,10,15,20-tetraphenylporphyrinato)zinc(II) in cetyltrimethylammonium chloride reversed micellar solutions

The acid dissociation of (5,10,15,20-tetraphenylporphyrinato)zinc(II), Zn(tpp), dispersed in reversed micellar media of cetyltrimethylammonium chloride (CTAC) in chloroform/water and chloroform-cyclohexane/water, was studied using a stopped-flow spectrophotometer. When Zn(tpp) was mixed with the reversed micellar solution containing a concentrated acid, its dissociation, which followed immediate formation of the chloro-coordinated complex Zn(tpp)Cl- in the interfacial phase of the reverse micelle, rapidly took place to yield the diacid salt of 5,10,15,20-tetraphenylporphyrin, H4(tpp)2+(Cl-)2. The rate of acid dissociation increased as acid concentration in the reversed micellar aqueous pool increased. At higher acid concentrations (> 3 mol d/cu m in the pool), the rate constant and the fraction of Zn(tpp)Cl- formed increased in the order: HNO3 2SO4 4, and decreased as the volume fraction of cyclohexane in the reversed micellar bulk solvent increased.

Synthesis and characterization of new molecular complexation between free base meso-tetraarylporphyrins and nitrosonium ion as π-acceptor

NOBF4 reacts with para-substituted meso-tetraarylporphyrins, H2t(4-Xp)p, at room temperature for formation of green molecular complexes, [H2t(4-Xp)p(NO)]BF4. Mole ratio for the porphyrins and nitrosonium ion in the molecular complexes was 1:1, [H 2T(4-X)PP(NO)]BF4. FT-IR, UV-Vis, (1H and 13C) NMR spectral data, elemental analysis and molar conductivity indicated that NO+ (as electron acceptor) is bound to the lone electron pairs of the two pyrrolenine nitrogens in a side of the porphyrin plane. In these molecular complexes, two pyrrolic nitrogen atoms of the porphyrin core coordinate to the acceptor and two protons of the pyrrolic nitrogen atoms have been remained on the porphyrin macrocycles. Molecular complexation of meso-tetraarylporphyrins with NO+ produces a large downfield shift for the NH signal.

Meso-tetracinnamylporphyrin: Synthesis, characterization and the catalytic activity of its Mn(III) complex in olefin epoxidation with tetra-n-butylammonium hydrogen monopersulfate

Meso-tetracinnamylporphyrin (H2tcp) has been synthesized and characterized by UV-Vis, 1H NMR and IR spectroscopies. Protonation of H2tcp with HCl is accompanied by a blue shift (77 cm-1) of the Q(0,0) band, probably indicating a decrease in the efficiency of the π-electron donation from the meso-substituents to the a2u orbital in comparison with the corresponding dication of meso-tetraphenylporphyrin (H2tpp). The unusual NH signal multiplicity observed in 1H NMR spectrum of H2tcp shows evidence of a long distance coupling between the vinyl protons and NH ones. This long range coupling can occur between the remote centers using the a2u orbital as a connector. Mntcp(OAc) shows higher catalytic activity (ca. 1.2-fold higher) than Mntpp(OAc) in olefin epoxidation with tetra-n-butylammonium hydrogen monopersulfate (TBAO). The low ratio (～1.5) of cis- to trans-stilbene oxide, in competitive oxidation of cis- and trans-stilbene with TBAO, strongly suggests the involvement a common high-valent manganese oxo complex as the reactive intermediate responsible for oxygen atom transfer.

Reorganization energies of diprotonated and saddle-distorted porphyrins in photoinduced electron-transfer reduction controlled by conformationaldistortion

Kinetics of photoinduced electron transfer from a series of electron donors to the triplet excited states of a series of nonplanar porphyrins, hydrochloride salts of saddle-distorted dodecaphenylporphyrin ([H 4 DPP]Cl 2 ), tetrakis(2,4,6-trimethylphyenyl