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Synthesis of a Bulky Bis(carbene)borate Ligand – Contrasting Structures of Homoleptic Nickel(II) Bis(pyrazolyl)borate and Bis(carbene)borate Complexes
Author(s) -
Nieto Ismael,
Bontchev Ranko P.,
Smith Jeremy M.
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800034
Subject(s) - chemistry , carbene , homoleptic , ligand (biochemistry) , boron , deprotonation , nickel , octahedron , medicinal chemistry , crystallography , stereochemistry , crystal structure , organic chemistry , catalysis , metal , ion , biochemistry , receptor
Twofold deprotonation of the “boronium” cation H 2 B( t BuImH) 2 + I – provides access to the bulky bis(carbene)borate ligand H 2 B( t BuIm) 2 – . Transfer of the ligand to Ni II sources affords the square‐planar, diamagnetic complex Ni[H 2 B( t BuIm) 2 ] 2 . The properties of this complex are contrasted with the related bis(pyrazolyl)borate complex Ni[H 2 B( t Bupyr) 2 ] 2 , which is octahedral and paramagnetic. Density functional theory has been used to evaluate the reasons for the structural differences. Stabilization of the square‐planar geometry by the bis(carbene)borate ligand can be ascribed to its greater donor ability.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)