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Synthesis and Structural Characterization of 1,4‐Diazadiene Imido Tungsten Complexes
Author(s) -
Merkoulov Alexei,
Harms Klaus,
Sundermeyer Jörg
Publication year - 2005
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/zaac.200500211
Subject(s) - chemistry , moiety , steric effects , ligand (biochemistry) , bond length , crystal structure , stereochemistry , lewis acids and bases , tungsten , medicinal chemistry , crystallography , catalysis , organic chemistry , biochemistry , receptor
The reaction of [W(NR)Cl 4 (L)] (R = Ph, Cy; L = thf) and Li 2 DAD (DAD = 1,4‐di‐tert‐butyl‐1,4‐diazabuta‐1,3‐diene) leads to the formation of [(DAD)W(NR)Cl 2 ], R = Ph ( 1 ), R = Cy ( 2 ). Both complexes are examples of a growing class of complexes displaying an uncommon combination of two highly charged sterically demanding 6‐electron donors, NR 2‐ and DAD 2‐ , at one coordination site. Surprisingly both complexes show weak Lewis acidity and don't react with σ‐donors such as PMe 3 and THF. The crystal structure determination of 1 reveals a mononuclear molecular structure with folded DAD 2‐ moiety. In accord with spectroscopic data and the W‐N, C‐N and C‐C bond lengths of the DAD ligand, the obtained compounds should be described as W VI imido ene‐diamido species.