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Neutron Diffraction Study of [K(18‐crown‐6)] [(PPh 3 ) 2 ReH 6 Cr(CO) 3 ], a Bimetallic Donor‐Acceptor Complex ☆
Author(s) -
Drabnis Mary H.,
Bau Robert,
Mason Sax A.,
Freeman Jeffrey W.,
Ernst Richard D.
Publication year - 1998
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199806)1998:6<851::aid-ejic851>3.0.co;2-1
Subject(s) - chemistry , bimetallic strip , crystallography , hydride , acceptor , crystal structure , neutron diffraction , x ray crystallography , single crystal , stereochemistry , diffraction , metal , physics , organic chemistry , optics , condensed matter physics
A neutron diffraction analysis was carried out at 120 K on a single crystal of [K(18‐crown‐6)][(PPh 3 ) 2 ReH 6 Cr(CO) 3 ] · THF in order to locate the hydride ligands. Three of the hydrides are bound terminally to the Re atom while the other three bridge the Re–Cr bond; the bridging hydrides are closer to the Re atom. This compound can be thought of as a donor–acceptor complex, with [(PPh 3 ) 2 ReH 6 ] – acting as the donor to the Cr(CO) 3 fragment. Average distances and angles: Re–Cr = 2.58(1), Re–H(br) = 1.75(1), Cr–H(br) = 1.92(2), Re–H(t) = 1.69(1) Å; Re–H–Cr = 89.1(7)°. Final agreement factors: R ( F ) = 6.4% for 3443 reflections with I > 2σ( I ), and R ( F ) = 8.3% for all data (4195 reflections).