The reaction of iron(III) and cobalt(III) porphyrin perchlorates with trimethylsilyldiazomethane
作者:Jun-ichiro Setsune、Toshiya Iida、Teijiro Kitao
DOI:10.1016/s0040-4039(00)80844-8
日期:——
The reaction of perchloratoiron(III) and -cobalt(III) octaethylporphyrins with trimethylsilyldiazomethane afforded N,metal-methano bridged organometalloporphyrins which further reacted with the carbene to give N(21),N(22)- and N(21),N(23)-ethano bridged porphyrin hydroperchlorates, selectively.
High-spin cobalt(II) complexes of N-alkyl-octaethylporphyrin have been characterized by 1H-NMR measurements. Proton signals of N-alkyl groups and aromatic meso-protons were assigned by deuteration method. Axially coordinated imidazole resonance appeared at very low magnetic field.
N-烷基-八乙基卟啉的高自旋钴 (II) 配合物已通过 1 H-NMR 测量进行表征。N-烷基基团和芳族介子质子的质子信号通过氘化方法分配。轴向配位咪唑共振出现在非常低的磁场中。
PREPARATION AND CHARACTERIZATION OF IRON(III) COMPLEXES OF<i>N</i>-METHYLOCTAETHYLPORPHYRIN
Iron(III) complexes of N-methyloctaethylporphyrin, [Fe(III)-(N–CH3-OEP) (Cl)]+ X− (X = FeCl4 (1), ClO4 (2)), were prepared. The central metal of complex (2) is confirmed to be in a high-spin (S = 5/2) state on the basis of magnetic susceptibility and ESR parameters. These complexes form monopyridine adducts in solution.
Effect of the type of molecular nonplanar structure on the chemical reactivity of NH bonds in the coordination center of porphyrin molecule
作者:D. B. Berezin、O. V. Mal’tseva
DOI:10.1134/s1070363209040276
日期:2009.4
Effect of out-of-plane screwing of the porphyrin macrocycle (H2P) by means of tetra-meso-substitution and intracyclic N-substitution on the state of NH bonds in the molecule is explored. By applying H-1 NMR, kinetic and quantum-chemical criteria of evaluation of the macrocycle NH-reactivity is found that such type of H2P screwing does not increase reactivity of the NH bonds. It is shown that increased chemical NH activity is observed only in the porphyrins undergoing at a significant conformational screwing possess the polarization of the molecular pi-system.