Copyright © Lo and Ng 2008
aDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
Correspondence e-mail: seikweng/at/um.edu.my
Received August 8, 2008; Accepted August 27, 2008.
This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
The PbIV atom of the anion of the title salt, (C7H11N2)2[PbBr4(C6H5)2], is situated on a crystallographic center of inversion and exhibits a tetragonally compressed octahedral coordination. One of the two independent Br atoms acts as a hydrogen-bond acceptor towards the NH group of the cation.
Data collection: APEX2 (Bruker, 2007 ); cell refinement: SAINT (Bruker, 2007 ); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ); molecular graphics: X-SEED (Barbour, 2001 ); software used to prepare material for publication: publCIF (Westrip, 2008 ).
We thank the University of Malaya for funding this study (SF022155/2007 A) and also for the purchase of the diffractometer.
supplementary crystallographic information
Tetraphenyllead (1.55 g, 3 mmol) and 4-dimethylaminopyridinium hydrobromide perbromide (1.1 g, 3 mmol) were heated in chloroform (100 ml) for 3 h. The filtered solution when allowed to evaporate yielded large colorless crystals.
Carbon-bound H-atoms were placed in calculated positions (C—H 0.95 to 0.98 Å) and were included in the refinement in the riding model approximation, with U(H) set to 1.2 to 1.5Ueq(C). The ammonium H atom was similarly constrained (N–H 0.88 Å).
The difference Fourier map had large peaks/deep holes near the lead atom.
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2)
Atomic displacement parameters (Å2)
Geometric parameters (Å, °)
Symmetry codes: (i) −x+1, −y+1, −z+1.
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