Synthesis and crystal structure of N-benzylmethy- lammonium pentachlorothallate (III), [C₆H₅CH₂NH₂CH₃]₂TlCl₅

Structural Diversity in Thallium Chemistry. Part VI

“…Propagation of the interionic H-bonds by If so, is their geometry square-pyramidal, or is a trigonal-bipyramidal coordination geometry preferred? One example of each geometry is known for discrete [TlCl 5 ] 2À anions [36] [37]. Is there a preference for octahedral coordination of Tl III by bromide, even in compounds without [TlBr 6 ] 3À stoichiometry, as found with some chlorothallate(III) structures [38 -44], which will lead to Br-bridged binuclear or polynuclear anions?…”

“…One objective of this project was to determine if the discrete [TlBr 5 ] 2À anion could be generated, and, if so, whether it would adopt a trigonal-bipyramidal or square-pyramidal coordination geometry. Only two unambiguous solid-state structures involving a discrete [TlCl 5 ] 2À ion are known and provide one example of each of these geometries [36] [37], so afford no indication of a preferred coordination geometry for pentahalothallate(III) anions. The initial investigations utilized the piperazinium and 2,2'-bipyridinium cations (XXI and XXII, resp.…”

“…Structures with discrete [TlCl 5 ] 2À anions are also quite rare [36] [37], because of a tendency to form binuclear or polynuclear anions such as [Tl 2 Cl 10 ] 4À [38 -44], but quaternary ammonium cations have not been used extensively to generate chlorothallate(III) salts, so the question is open as to whether such cations could be employed to obtain discrete [TlCl 5 ] 2À anions or structures similar to or different from those of the bromothallates. B. D. J. is pleased to acknowledge continuing support from the Faculty of Science, Technology and Engineering, La Trobe University.…”

Intermolecular interactions in 2,5-dimethylpyrazinium tetrabromidothallate(III)

“…For general background, see: Abdi et al (2004); Castiñ eiras et al (1991); Cui et al (2000); Lacroix et al (1994); Chakravarthy & Guloy (1997); Huang & Wang (2007); Al-Far & Ali (2007b). For related literature, see: Abdi et al (2005); He et al (2002); Linden et al (2002); Al-Far & Ali (2007a); Hao & Liu (2007); Churakov et al (2006); Yang et al (2004).…”

“…Data collection: SMART (Bruker, 2001); cell refinement: SAINT (Bruker, 2006); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Bruker, 2004); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL. (Abdi et al, 2004 and references therein). However, Tl(III) complexes containing Tl(III) anionic speciesorganic cations are relatively small (Abdi et al, 2004;Castineiras et al, 1991).…”