Heterometallic Mercury Compounds: Classification and Analysis of Crystallographical and Structural Data

Abstract

Mercury is classed as a heavy metal both from its physical properties and its biochemical behaviour.This review includes over two hundred heterometallic mercury compounds of known crystal structure.The heterometal atoms include both transition and non-transition metals, including both hard (class A) and soft (class B) examples. The compounds range from simple hetero-double salts and hetero-bimetallic derivatives to heterometallic clusters of up to twenty one metal atoms. Examples of isomerism include distortion, polymer and linkage isomers. Correlations between structural parameters, heterometal and ligand donor atoms are developed and an overall summary of the metal-metal bonding distances is given.

Zn(II), Cd(II) and Hg(II) complexes with 2,2′-Biquinoline, syntheses and X-ray crystal structures of [Hg(bq)(SCN)2]

“…1 and selected bond lengths and angles are given in Table II 2 ]}. These variations may be a consequence of the initial electron withdrawing effect of the phenyl rings and also their spatial effects.…”

“…These variations may be a consequence of the initial electron withdrawing effect of the phenyl rings and also their spatial effects. 2 ] complex is in the -stacking [14,15] interaction between the parallel aromatic rings of adjacent chains as shown in Fig. 2.…”

“…The ability of zinc(II), cadmium(II) and mercury(II) salts to form a wide variety of 1 : 1 and 1 : 2 complexes with neutral ligands is well documented [1][2][3][4][5]. The most common neutral donors are phosphine and amine derivatives.…”

Cadmium Coordination Compounds: Classification and Analysis of Crystallographic and Structural Data

“…In general, coordination number seven is relatively rare, but of the zinc subgroup cadmium has the most examples (Zn has 18 [81]; Hg has none [13]). The most common geometry is that of the pentagonal bipyramid [ From the data in Table 5 …”

“…In five derivatives [179,221,222 In the zinc derivatives [81 ] only two eight-coordinate species have been found, both dodecahedral. In the mercury series [13] …”