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Structural explanation of the spectral features of the nonsymmetrical complex {2,3,7,8,12,13,17,18‐octaethyl‐5‐[(methylimino)methyl]porphyrinato‐κ 4 N 21 , N 22 , N 23 , N 24 }palladium(II)
Author(s) -
Erzina Dina R.,
Zamilatskov Ilya A.,
Kurochkidezhda M.,
Ponomarev Gelii V.,
Tafeenko Victor A.
Publication year - 2017
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229616020465
Subject(s) - bathochromic shift , porphyrin , steric effects , chemistry , crystallography , planarity testing , absorption spectroscopy , stereochemistry , absorption (acoustics) , photochemistry , fluorescence , materials science , physics , composite material , quantum mechanics
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(C 38 H 47 N 5 )], 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.