Platinum porphyrinsV. Multinuclear NMR of some platinum(IV) porphyrins
摘要:
Multinuclear (i.e. H-1 C-13 and Pt-195) NMR spectra of six platinum(IV) porphyrin complexes are reported. Compared with their platinum (II) porphyrin precursors, alphacarbon (C-alpha) resonances are shifted further upfield, H-1-Pt-195 and C-13-(195)pt coupling constants are significantly reduced, Pt-195 resonances are shifted further downfield (their relative positions being more strongly affected by macrocyclic substitution) and (195)pt peaks are appreciably narrowed. These differences are rationalized in terms of oxidation leading to reduced coupling of (195)pt to the N-14 C-13 and H-1 atoms of the porphyrin, a slight increase in d-pi(*) back-bonding and its modulation by porphyrin substituents.
Design of oxygen sensing nanomaterial: synthesis, encapsulation of phenylacetylide substituted Pd(<scp>ii</scp>) and Pt(<scp>ii</scp>) meso-tetraphenylporphyrins into poly(1-trimethylsilyl-1-propyne) nanofibers and influence of silver nanoparticles
palladium(II) or platinum(II) meso-tetraphenylporphyrins in poly(1-trimethylsilyl-1-propyne) in the form of nanofibers along with/without silver nanoparticles. These materials combine the advantages of the high oxygen sensitivity of porphyrins and the enhanced surface area of porous nanofibers. Phenylacetylide bearing palladium(II) or platinum(II) meso-tetraphenylporphyrins (Pd-TPA, Pt-TPA, Pd-TPP and
which possess metal–N coordination centers, are important building blocks for the construction of porous organic materials with catalytic performance. However, most of the previous work has focused on controlling the metal elements instead of the metal–N coordinations. Here, Pt(II) N–confused porphyrin and Pt(II) porphyrin based conjugated microporous polymers were synthesized by Yamamoto coupling
具有金属-N配位中心的金属卟啉是构建具有催化性能的多孔有机材料的重要组成部分。然而,以前的大部分工作都集中在控制金属元素而不是金属-N 配位。在这里,通过 Yamamoto 偶联反应合成了 Pt( II ) N-混淆卟啉和 Pt( II ) 卟啉基共轭微孔聚合物。研究了Pt-N 3 C 和Pt-N 4的结构和性能差异。计算表明,与传统的 Pt-N 4基多孔聚合物相比,Pt-N 3 C 基多孔聚合物具有更宽的光吸收和更窄的带隙。