Various bis-dmio and -dmit zincate complexes, [Q]<SUB>2</SUB>[Zn(dmio)<SUB>2</SUB>] [Q = NEt<SUB>4</SUB>, 1,4-dmp, Ph<SUB>4</SUB>P and FcCH<SUB>2</SUB>NMe<SUB>3</SUB>] and [Q]<SUB>2</SUB>[Zn(dmit)<SUB>2</SUB>] [Q = FcCH<SUB>2</SUB>NMe<SUB>3</SUB>], have been prepared and characterised by IR, <SUP>1</SUP>H and <SUP>13</SUP>C-NMR spectral and elemental analysis data. The solid state structure of [FcCH<SUB>2</SUB>NMe<SUB>3</SUB>]<SUB>2</SUB>[Zn(dmio)<SUB>2</SUB>] was determined by X-ray crystallography. The complexes, [Q]<SUB>2</SUB>[Zn(dmio)<SUB>2</SUB>] and [Q]<SUB>2</SUB>[Zn(dmit)<SUB>2</SUB>], have been further used as precursors of various dmio and dmit complexes of tin (IV) and antimony (III) and (V). Metal exchange reactions with these complexes have also been investigated. The neutral tin compounds, R<SUB>2</SUB>Sn(dmio) [RR' = Me<SUB>2</SUB>, Et<SUB>2</SUB>, Bu<SUB>2</SUB>, Ph<SUB>2</SUB> and MeO<SUB>2</SUB>CH<SUB>2</SUB>CH<SUB>2</SUB>] have been synthesised and characterised by IR, <SUP>1</SUP>H, <SUP>13</SUP>C and <SUP>119</SUP>Sn-NMR spectral and elemental analysis data and for Me<SUB>2</SUB>Sn(dmio) by X-ray diffraction. The compounds, [Q][R<SUB>2</SUB>Sn(dmio)X] [Q = NEt<SUB>4</SUB>, FcCH<SUB>2</SUB>NMe<SUB>3</SUB> ; R = Ph, Et ; X = Cl] and [Q][R<SUB>2</SUB>(dmit)X] [Q = FcCH<SUB>2</SUB>NMe<SUB>3</SUB> ; R = Ph ; X = Cl], have been prepared and halide (X) exchange reactions in [Q][R<SUB>2</SUB>Sn(dmio)X] [Q = NEt<SUB>4</SUB> ; R=Ph ; X=Cl] have been investigated using alkali metal halides and pseudohalides [NaI, NaBr and NaSCN]. The solid state structures of [NEt<SUB>4</SUB>][Ph<SUB>2</SUB>Sn(dmio)Cl], [NEt<SUB>4</SUB>][Ph<SUB>2</SUB>Sn(dmio)-SCN] and [NEt<SUB>4</SUB>][NEt<SUB>4</SUB>][Et<SUB>2</SUB>Sn(dmio)Br] have been determined. The monoestertin bis-dmio complexes, [Q][MeO<SUB>2</SUB>CCH<SUB>2</SUB>CH<SUB>2</SUB>Sn(dmio)<SUB>2</SUB>] [Q = NEt<SUB>4</SUB>, 1,4-dmp and Ph<SUB>4</SUB>P] and the neutral diestertin dmio complex, [(MeO<SUB>2</SUB>CCH<SUB>2</SUB>CH<SUB>2</SUB>)<SUB>2-</SUB>Sn(dmio)], have been synthesised and characterised. The solid state structure of [NEt<SUB>4</SUB>][MeO<SUB>2</SUB>CCH<SUB>2</SUB>CH<SUB>2</SUB>Sn(dmio)<SUB>2</SUB>] has been determined. Also, the tris-dmio and dmit complexes, [Q]<SUB>2</SUB>[Sn(dmit)<SUB>3</SUB>] [Q = NEt<SUB>4</SUB>, 1,4-dmp, Ph<SUB>4</SUB>P and FcCH<SUB>2</SUB>NME<SUB>3</SUB>] and [Q][Sn(dmit)<SUB>3</SUB>] [Q = FcCH<SUB>2</SUB>NMe<SUB>3</SUB>] have been prepared and characterised. The antimony (III) bis-dmio complexes, [Q][Sb<SUP>III</SUP>(dmio)<SUB>2</SUB>] [Q = NEt<SUB>4</SUB>, 1,4-dmp, Ph<SUB>4</SUB>P and FcCH<SUB>2</SUB>NMe<SUB>3</SUB>], and antimony (III) bis-dmit complex, [Q][Sb<SUP>III</SUP>(dmio)<SUB>2</SUB>] [Q = FcCH<SUB>2</SUB>NMe<SUB>3</SUB>], have been synthesised and fully characterised by IR, <SUP>1</SUP>H and <SUP>13</SUP>C-NMR spectral and elemental analysis data.