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New Routes to a Series of σ‐Borane/Borate Complexes of Molybdenum and Ruthenium
Author(s) -
Ramalakshmi Rongala,
Saha Koushik,
Roy Dipak Kumar,
Varghese Babu,
Phukan Ashwini K.,
Ghosh Sundargopal
Publication year - 2015
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.201503404
Subject(s) - ruthenium , borane , molybdenum , boron , series (stratigraphy) , chemistry , inorganic chemistry , organic chemistry , geology , catalysis , paleontology
A series of agostic σ‐borane/borate complexes have been synthesized and structurally characterized from simple borane adducts. A room‐temperature reaction of [Cp*Mo(CO) 3 Me], 1 with Li[BH 3 (EPh)] (Cp*=pentamethylcyclopentadienyl, E=S, Se, Te) yielded hydroborate complexes [Cp*Mo(CO) 2 (μ‐H)BH 2 EPh] in good yields. With 2‐mercapto‐benzothiazole, an N,S‐carbene‐anchored σ‐borate complex [Cp*Mo(CO) 2 BH 3 (1‐benzothiazol‐2‐ylidene)] ( 5 ) was isolated. Further, a transmetalation of the B‐agostic ruthenium complex [Cp*Ru(μ‐H)BHL 2 ] ( 6 , L=C 7 H 4 NS 2 ) with [Mn 2 (CO) 10 ] affords a new B‐agostic complex, [Mn(CO) 3 (μ‐H)BHL 2 ] ( 7 ) with the same structural motif in which the central metal is replaced by an isolobal and isoelectronic [Mn(CO) 3 ] unit. Natural‐bond‐orbital analyses of 5–7 indicate significant delocalization of the electron density from the filled σ BH orbital to the vacant metal orbital.