Crystal Structure of alpha-Tetraethylammonium Trichloromercurate(II).

Structure of chloro-N,N,N',N'-tetramethylformamidinium bis[dichloromercury(II)] chloride

“…In trigonal bipyramidal coordination, three equatorial bonds of about 2.3-2.5 A are found together with two long axial Hg-C1 bonds up to 3.1 A. Such coordination has been observed in (C2Hs)4NHgC13 (Sandstr6m & Liem, 1978), (CH3)3SHgCI a (Biscarini, Fusina, Nivellini & Pelizzi, 1977), S4N3HgCI a (Weidenhammer & Ziegler, 1977) and (CHa)3NHHg2C13 (Ben Salah et al, 1983). A coordination number of five has been reported also for C6HsCH2NH3Hg2CI 5 (Bats, Fuess & Daoud, 1980) and for CH3NHaHgCIa and CH3NH3Hg2C15 (Ben Salah, Bats, Kalus, Fuess & Daoud, 1982).…”

Reactions of transition-metal carbonyl anions with Group IIB metal acceptors and the crystal structure of tetrabutylammonium tris(dicarbonyl(.eta.5-cyclopentadienyl)iron)zincate

“…This effect has been observed in the trichloromercurate(II) anion, HgCl3~, where the Hg-Cl distances range from 2.426 (3) to 2.444 (3) Á. 45 The crystal structures of the corresponding tribromomercurate44 and triiodomercurate43 anions show some differences in distances, but these differences are not statistically significant (>3 ).…”

Crystal structure determination of complexes of monomethylammonium chloride and mercury(II) chloride: CH3NH3HgCl3, (CH3NH3)2HgCl4, and CH3NH3Hg2Cl5

“…The trigonal bipyramid with a coordination number of 5 is formed by three equatorial Hg-C1 bonds of about 2.35-2.5 d and two long axial Hg-C1 bonds up to 3.1 d, as found in (C,H,),NHgCl, [9], (CH,),SHgCl, [lo] and S,N,HgCl, [Ill. Fairly regular tetrahedra have been observed in [(CH,),N],HgC14 [12] and Cs,HgCl, [13] with a distance of 2.45-2.5 A.…”