The infrared spectra have been studied for cis-and trans-isomers of complexes of the type [Co(en),-(halac),]C104, where en = ethylenediamine and halac = CH3CO2-, CH2ClC0,-, CHCIZCO,-, CCl,CO,-, CHBr,C02-, and CF3C0,-. Characteristic differences between the spectra of cis-and :mlrs-isomers have been examined and correlated mith data for similar complexes. The most consistent variations are in the 500-610 cm-I region where Co-N stretching modes occur.

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A comparative study has been made of 5-methyl-1,2,3-cyclohexanetrionetrioxime with nioxime and din~ethylglyoxime; complexes with nickel, copper, and cobalt have been investigated. Dissociation constants of the three reagents, in aqueous solution, have been determined and formation constants of their copper complexes evaluated. Spectrophotornetric and potentiometric studies were used to obtain the results.

Square planar complexes of nickel(II), palladium(II), and platinum(I1) containing the ligand thiosemicarbazide (Htsc) have been studied. Both the cis and trarzs geometric isomers have been obtained for the complexes with the general formula [M(Htsc)2I2 + while only the trans isomer was obtained for the neutral species [M(tsc),]. lnfraredand diffusereflectancespectra are presented and discussed with reference to the stereochemistry of the complexes.

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