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Ruthenium Complexes with the Stanna‐ closo ‐dodecaborate Ligand: Coexistence of η 1 (Sn) and η 3 (BH) Coordination
Author(s) -
Gädt Torben,
Grau Beatrice,
Eichele Klaus,
Pantenburg Ingo,
Wesemann Lars
Publication year - 2006
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.200500761
Subject(s) - ruthenium , isostructural , chemistry , ligand (biochemistry) , moiety , stereochemistry , crystal structure , crystallography , coordination complex , oxidation state , medicinal chemistry , metal , catalysis , organic chemistry , biochemistry , receptor
Four stanna‐ closo ‐dodecaborate complexes of ruthenium have been prepared and characterized by multinuclear NMR studies in solution and in the solid state. The solid‐state structures of the dimeric zwitterions [{Ru(dppb)(SnB 11 H 11 )} 2 ] ( 2 ) (dppb=bis(diphenylphosphino)butane), [{Ru(PPh 3 ) 2 (SnB 11 H 11 )} 2 ] ( 3 ), and the dianionic ruthenium complex [Bu 3 MeN] 2 [Ru(dppb){2,7,8‐(μ‐H) 3 ‐ exo ‐SnB 11 H 11 }(SnB 11 H 11 )] ( 4 ) were determined by X‐ray crystal structure analysis; they establish an unprecedented structural motif in the chemistry of heteroboranes and transition‐metal fragments with the stanna‐ closo ‐dodecaborate moiety as a two‐faced ligand that exhibits η 1 (Sn) as well as η 3 (BH) coordination. The η 3 ‐coordinated stannaborate in 4 and in the isostructural compound [Bu 3 MeN] 2 [Ru(PPh 3 ) 2 {2,7,8‐(μ‐H) 3 ‐ exo ‐SnB 11 H 11 }(SnB 11 H 11 )] ( 5 ) shows fluxional behavior, which was studied in detail by using 31 P{ 1 H} EXSY and DNMR experiments. The activation parameters for the dynamic process of 5 are given.