Complexes of Zinc Group Metals

Zn2L6(C104)4 xH20 (L = quxNO, x = 10 L = quxN02,x = 12)(39,40) are considered to involve one or two monodentate perchlorates. In the dimeric complexes, the metal ions are again bridged by two of the N-oxide ligands. 

Perchlorate Frequencies of Zinc Group Metal Complexes 

Sandstrom (146) has established by X-ray analysis unidentate coordination of two of the perchlorates to one of the metal ions (Hg—O length = 2.78, 3.04 A Hg—O—Cl angle = 161,123°) in the binuclear complex Hg2(dmso)8(C104)4 The metal ions bridged through two of the eight dmso molecules assume distorted octahedral geometries. X-ray evidence has been presented by Epstein et al. (147) for the presence of a weakly bonded perchlorate in a seven-coordinate mercury(II) complex 

Bidentate coordination of one or two perchlorates has been proposed in a thorium(IV) complex of composition Th(Ph3P0)4(C104)4 (20). 

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