Structural explanation of the spectral features of the nonsymmetrical complex {2,3,7,8,12,13,17,18-octaethyl-5-[(methylimino)methyl]porphyrinato-κ4N21,N22,N23,N24}palladium(II)
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- 作者：Dina R. Erzina ; Ilya A. Zamilatskov ; Nadezhda M. Kurochkina ; Gelii V. Ponomarev and Victor A. Tafeenko
- 关键词：nonsymmetrical metalloporphyrin ; disorder ; electronic absorption spectrum ; spectral features ; crystal structure
- 刊名：Acta Crystallographica Section C
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：73
- 期：2
- 页码：68-71
- 全文大小：732K
- ISSN：1600-5759
文摘
The features of porphyrins defining their functionality are related to their conformational flexibility. The degree of nonplanarity of metalloporphyrins depends directly on the number of substituents, their size and their location. The introduction of substituents in the meso positions of β-substituted porphyrins increases the steric interaction and leads to distortions of the porphyrin core. Increasing the distortion of the porphyrin core would augment the bathochromic (red) shift of the electronic absorption spectra. A new nonsymmetrical 2,3,7,8,12,13,17,18-octaethyl-5-[(methylimino)methyl]porphyrin complex of palladium(II), [Pd(C38H47N5)], was synthesized and characterized by NMR, mass spectrometry and X-ray analysis. The features of the electronic absorption spectrum of the synthesized complex are explained by the planarity of the porphyrin core and the π-system of the imino group orthogonal to it.