Silver(I) poly(1,2,3-benzotriazolyl)borate complexes containing mono- and bidentate phosphine coligands |
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| Authors: | Giancarlo Gioia Lobbia Claudio Pettinari Brian W Skelton |
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| Institution: | a Dipartimento di Scienze Chimiche, Università degli Studi di Camerino, via S. Agostino 1, 62032 Camerino MC, Italy
b Department of Chemistry, The University of Western Australia, Crawley, W. A. 6009, Australia |
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| Abstract: | New silver(I) derivatives Ag{HnB(btz)4 − n}(PR3)x] (n = 1 or 2, x ranging from 1 to 3), containing monodentate tertiary phosphines and anionic poly(benzotriazol-1-yl)borates, have been prepared from the reaction of AgNO3 with PR3 (R = Ph, o-tolyl, m-tolyl, p-tolyl, Bns) and KH2B(btz)2], or KHB(btz)3] (Hbtz = 1,2,3-benzotriazole). When the reaction between KH2B(btz)2] and AgNO3 was carried out in the presence of dppe (1,2-bis(diphenylphosphino)ethane), or dppf (1,1′-bis(diphenylphosphino)ferrocene), compounds Ag{H2B(btz)2}]2(L) (L = dppe or dppf) formed, the diphosphine acting as a bidentate bridging P2-donor. Solid state and solution properties of all complexes have been investigated through analytical and spectroscopic measurements (IR, 1H, 31P NMR), the 1H and 31P NMR spectra being interpreted in terms of equilibria that involve mono- and di-nuclear complexes. Adducts Ag{HB(btz)3}(PPh3)3] · (1/2H2O) and Ag{H2B(btz)2}]2 (dppf) have been characterised by single crystal X-ray studies. In the former, the HB(btz)3 is unidentate in an NAgP3 coordination environment; the latter is a dimer, the dppf bridging the two silver atoms, while the H2B(btz)2 ligand, which chelates one silver, bridges to the second also, the array having 2-symmetry. |
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| Keywords: | Benzotriazole X-ray Scorpionates Silver Phosphines Spectroscopy |
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