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New Trinuclear Complexes of Group 6, 8, and 9 Metals with a Triply Bridging Borylene Ligand
Author(s) -
Yuvaraj K.,
Bhattacharyya Moulika,
Prakash Rini,
Ramkumar V.,
Ghosh Sundargopal
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201600637
Subject(s) - isostructural , chemistry , crystallography , ligand (biochemistry) , transition metal , stereochemistry , crystal structure , catalysis , biochemistry , receptor
Trinuclear complexes of group 6, 8, and 9 transition metals with a (μ 3 ‐BH) ligand [(μ 3 ‐BH)(Cp*Rh) 2 (μ‐CO)M′(CO) 5 ], 3 and 4 ( 3 : M′=Mo; 4 : M′=W) and 5 – 8 , [(Cp*Ru) 3 (μ 3 ‐CO) 2 (μ 3 ‐BH)(μ 3 ‐E)(μ‐H){M′(CO) 3 }] ( 5 : M′=Cr, E=CO; 6 : M′=Mo, E=CO; 7 : M′=Mo, E=BH; 8 : M′=W, E=CO), have been synthesized from the reaction between nido ‐[(Cp*M) 2 B 3 H 7 ] ( nido‐ 1 : M=Rh; nido‐ 2 : M=RuH, Cp*=η 5 ‐C 5 Me 5 ) and [M′(CO) 5 ⋅ thf] (M′=Mo and W). Compounds 3 and 4 are isoelectronic and isostructural with [(μ 3 ‐BH)(Cp*Co) 2 (μ‐CO)M′(CO) 5 ], (M′=Cr, Mo and W) and [(μ 3 ‐BH)(Cp*Co) 2 (μ‐CO)(μ‐H) 2 M′′H(CO) 3 ], (M′′=Mn and Re). All compounds are composed of a bridging borylene ligand (B−H) that is effectively stabilized by a trinuclear framework. In contrast, the reaction of nido ‐ 1 with [Cr(CO) 5 ⋅ thf] gave [(Cp*Rh) 2 Cr(CO) 3 (μ‐CO)(μ 3 ‐BH)(B 2 H 4 )] ( 9 ). The geometry of 9 can be viewed as a condensed polyhedron composed of [Rh 2 Cr(μ 3 ‐BH)] and [Rh 2 CrB 2 ], a tetrahedral and a square pyramidal geometry, respectively. The bonding of 9 can be considered by using the polyhedral fusion formalism of Mingos. All compounds have been characterized by using different spectroscopic studies and the molecular structures were determined by using single‐crystal X‐ray diffraction analysis.