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Several diorganotin dichloride complexes of the type R2SnCl2.L (R=methyl, phenyl and L=phenylazo-, 3-tolylazo-, 4-tolylazo- and 4-chlorophenylazo-2-pyridine) have been synthesized and characterized. Investigation of the complexes by IR, 1H NMR, electronic spectral and 119Sn Mossbauer parameters indicated that their structure involved coordination of the pyridine and azo nitrogen to tin atom. 119Sn Mossbauer data (Q.S.=3.37−3.76 mm/sec.) suggest that the complexes are considered to have the two R-groups occupying trans-position in the distorted octahedral structures. Distortion of C-Sn-C bond angle from the linearity have also been calculated using Parish's relationship and lying among 148–155° (R=methyl) and 148–150° (R=phenyl).

The preparation of 1:2 and 1:1 mercury(II) chloride complexes with arylazo ligands is described. These compounds are freely soluble in methanol in they behave as non-electrolytes. Based on molar conductance, 1H n.m.r., electronic spectra and i.r. spectral features down to 200cm−1, complexes of arylazo-2-naphthol(L1H) and arylazopyridines (L3−L6) are considered as neutral, four-coordinated tetrahedral structures while complexes of arylazo-2-carboxylic acid (L2H) appear to be neutral, three-coordinated around mercury(II).

Coordinative interaction of uranylnitrate with 5-Azoxines containing different substituents in the aniline fragment have been studied. Infrared data suggests that the chelation of azoxines occurred exclusively in the oxinate moiety through the O and N atoms. These complexes have been characterised by spectral, magnetic measurements and elemental analysis.