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Synthesis, Spectroscopic Properties, and Crystal Structure of 2,2′‐Bipyridyldimesitylnickel(II)
Author(s) -
Klein Axel
Publication year - 2001
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200104)627:4<645::aid-zaac645>3.0.co;2-t
Subject(s) - monoclinic crystal system , chemistry , crystallography , crystal structure , solvatochromism , stereochemistry , molecule , organic chemistry
The dimesitylnickel(II) complex [(bpy)NiMes 2 ] (Mes = mesityl = 2,4,6‐trimethylphenyl) was prepared and examined spectroscopically and electrochemically. The crystal and molecular structure was determined from single crystal X‐Ray diffraction experiments (monoclinic, P2 1 /n, Z = 4, a = 8.3092(8) Å, b = 18.233(2) Å, c = 15.226(2) Å, β = 98.035(6)°). The nickel atom displays a distorted square planar environment. The axial positions of the square plane are shielded by each one of the methyl groups on the mesityl substituents. The complex shows electrochemical reduction processes that are mainly centered on the bpy ligand as inferred from spectroelectrochemical investigations (EPR and UV/Vis/NIR absorption) of the radical anion or dianion. The observed oxidation is assigned to a Ni II /Ni III couple. The title complex exhibits strongly solvatochromic longwavelength electronic absorptions.