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On the Reaction of [(CO) 3 Fe(μ‐Me 2 NCO) 2 Fe(CO) 2 (NHMe 2 )] with Chelating Ligands — X‐Ray Structures of New Binuclear μ‐Carbamoyl Complexes
Author(s) -
Petz Wolfgang,
Neumüller Bernhard,
Pudewills Jens
Publication year - 2004
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.200400054
Subject(s) - chemistry , ligand (biochemistry) , chelation , amine gas treating , medicinal chemistry , molar ratio , toluene , crystal structure , stereochemistry , crystallography , catalysis , inorganic chemistry , organic chemistry , receptor , biochemistry
Reaction of the binuclear μ‐carbamoyl complex [(CO) 3 Fe(μ‐Me 2 NCO) 2 Fe(CO) 2 (HNMe 2 )] ( 1 ) in toluene with the chelating ligands Ph 2 PCH 2 PPh 2 (dppm) and Ph 2 PCH 2 CH 2 PPh 2 (dppe) gives different results. With dppm only the complex [(CO) 3 Fe(μ‐Me 2 NCO) 2 Fe(CO) 2 (dppm)] ( 3 ) with a dangling ligand is obtained under replacement of amine, whereas with dppe depending on the reaction conditions up to three compounds are found. A 1 : 1 mixture of the educts generates the related complex [(CO) 3 Fe(μ‐Me 2 NCO) 2 Fe(CO) 2 (dppe)] ( 4 ) together with the tetranuclear complex [{(CO) 3 Fe(μ‐Me 2 NCO) 2 Fe(CO) 2 } 2 (dppe)] (5 ). 4 slowly converts into [(CO) 3 Fe(μ‐Me 2 NCO) 2 Fe(CO)(dppe)] ( 6 ) with dppe acting as a chelating ligand. 6 is the first compound in this series in which one of the five CO groups is replaced by another donor. A 2 : 1 molar ratio of 1 and dppe quantitatively produces 5 . Addition of CO to a solution of 6 proceeds under slow reversible conversion of the complex into 4 . The compounds were characterized by the usual spectroscopic methods; 3 , 5 and 6 were also studied by X‐ray diffraction analyses.