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Preparation and Structure of [Mo 4 (OMe) 2 (O i Pr) 10 ]; Comments on Why [W 2 (O i Pr) 6 ] Dimerizes, Whereas [Mo 2 (O i Pr) 6 ] Does Not
Author(s) -
Chisholm Malcolm H.,
Hammond Charles E.,
HampdenSmith Mark,
Huffmann John C.,
Van Der Sluys William G.
Publication year - 1987
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198709041
Subject(s) - alkoxide , molybdenum , tungsten , crystallography , chemistry , materials science , inorganic chemistry , metallurgy , catalysis , organic chemistry
A [MoMo] 6⊕ complex is thermodynamically more stable than a corresponding [WW] 6⊙ complex! It is assumed that this finding can be attributed to nuclear repulsive effects, which are larger in the case of tungsten than in the case of molybdenum. The structure of the title complex is characterized by two short and two long MoMo distances (2.238(1) and 3.344(1)Å, resp.) and thus by two bisalkoxide‐bridged MoMo units. The formation of alkoxide bridges could be an important step in the dimerization of [W 2 (O i Pr) 6 ].