Synthesis and structures of b-dialdiminatoantimony(III) halides and b-dialdiminium hexahalogenoantimoniates

Hitchcock, Peter B, Lappert, Michael F, Li, Gang and Coles, Martyn P (2009) Synthesis and structures of b-dialdiminatoantimony(III) halides and b-dialdiminium hexahalogenoantimoniates. Dalton Transactions, - (37). pp. 7820-7826. ISSN 1477-9226

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Abstract

From SbCl3, SbBr3 or SbI3 and an equivalent portion of the beta-dialdiminatopotassium compound K[{N(C6H3Pr2i-2,6) C(H)}(2)CPh] [ K(L)] in Et2O there was obtained in good yield the crystalline yellow [SbCl2(L)]center dot(0.5thf)center dot(0.5Et(2)O) (1) and the bis(bromo) analogue 2, or the orange [{SbI(L)(mu-I)}(2)]center dot(0.5Et(2)O) (3). Each of 1-3 was treated with the appropriate dihalogen (X-2) in Et2O. Thus, whereas 1 or 2 furnished the corresponding beta-dialdiminium hexahalogenoantimoniate [Et2O center dot center dot center dot H(L) H center dot center dot center dot OEt2][SbX6] (4, X = Cl; 6, X = Br), the iodo compound 3 afforded the known pyrazolium salt [N(C(6)H(3)Pr(i)2-2,6) C(H) C(Ph) C(H) N(C(6)H(3)Pr(i)2-2,6)][I-5]. It is suggested that the source of the additional 2HX, required to convert 1 or 2 with X2 in Et2O into 4 or 6, was derived from halogenation of the N-aryl groups of L. The formation of 4 or 6 was achieved by the alternative synthesis from equivalent portions of [H-2(L)] X, SbX3 and X-2 in diethyl ether. The X-ray structures of the isomorphous compounds 1 and 2 and 4 and 6, as well as of 3, are reported.

Item Type: Article
Additional Information: Crystallographer
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: Martyn Coles
Date Deposited: 06 Feb 2012 19:06
Last Modified: 21 Mar 2012 09:54
URI: http://sro.sussex.ac.uk/id/eprint/19270
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