Peripherally-metallated porphyrins: preparations, spectroscopic properties and structural studies of trans-[PtBr(MDPP)(PPh3)2](DPP = dianion of 5,15-diphenylporphyrin, M = MnCl, Co, Ni, Zn) and related meso-η1-organoplatinum porphyrins
摘要:
一系列含有 DPP(= 5,15-二苯基卟啉的二负离子)和第一排过渡金属离子 Mn(III)、Co(II)、Ni(II) 和 Zn(II) 的中间体η1-铂金属卟啉已被合成。报道了这些衍生物的合成、光谱学、电化学及晶体结构。附着在大环中间位的 –PtBr(PPh3)2 片段是一个强电子供体,其对光谱、氧化电位和反应性的影响有所体现。晶体结构的确定涉及 trans-[PtBr(MDPP)(PPh3)2]·0.5CH2Cl2,其中 M = Co (16)、Ni (14) 和 Zn (17),以及 trans-[PtBr(NiDPPBr)(PPh3)2]。这些结构表现出大环的非平面畸变,最佳描述为典型的皱褶和鞍形构象的混合体。
The effect of chemical modification of the macrocycle on the complex formation between porphyrins and metal salts in organic solvents
作者:O. V. Maltceva、N. Zh. Mamardashvili
DOI:10.1134/s1070363217060123
日期:2017.6
The complexformation of β-octaethylporphyrin, β-octaethyl-meso-monophenylporphyrin, β-octaethyl-meso-tetraphenylporphyrin, meso-diphenylporphyrin, meso-triphenylporphyrin, and meso-tetraphenylporphyrin with Zn(II), Cu(II), Co(II), and Mn(II) acetates and chlorides in dimethylformamide, dimethylsulfoxide, pyridine, acetic acid, and a chloroform–methanol 1 : 1 mixture has been studied by means of spectrophotometry
Metal Dependence of the Contributions of Low-Frequency Normal Coordinates to the Sterically Induced Distortions of Meso-Dialkyl-Substituted Porphyrins
作者:Xing-Zhi Song、Laurent Jaquinod、Walter Jentzen、Daniel J. Nurco、Song-Ling Jia、Richard G. Khoury、Jian-Guo Ma、Craig J. Medforth、Kevin M. Smith、John A. Shelnutt
DOI:10.1021/ic970465z
日期:1998.4.20
The influence of central metals of different sizes on the macrocyclic structure of a series of 5,15-disubstituted metalloporphyrins has been investigated with X-ray crystallography, molecular mechanics (MM) calculations, and resonance Raman spectroscopy. MM calculations indicate that the series of porphyrins are ina gabled (gab) conformation consisting of a linear combination of ruf (B-1u) and dam (A(2u)) out-of-plane normal-coordinate deformation types. The MM-calculated gab structures have been structurally decomposed into equivalent displacements along the lowest-frequency normal coordinate of each symmetry type. The contributions of each normal coordinate to the total distortion agree well with the contributions obtained from normal-coordinate structural decomposition of the X-ray crystal structures. Symmetry considerations show that any relative proportion of the ruf and dom deformations is allowed in the gab distortion. Varying the size of the central metal causes a change in the ratio of the dom/ruf contributions. A large metal like zinc disfavors ruffling over doming, significantly reducing the ruffling contribution and slightly increasing the doming contribution. In addition, the total degree of nonplanar distortion is reduced for large metals. This is confirmed for the series of disubstituted metalloporphyrins by smaller downshifts of the structure-sensitive Raman lines for the larger metals.