X-ray photoelectron spectroscopic study of metal complexes of substituted 2,4 pentanedione cis-bis ethylene diamino alkyl amino nitrito cobalt (III) nitrates; trans-bis (I-methyl-ethylenediamino)-bis (thiocyanato) cobalt(III) thiocyanate and trans-bis (propylene diamino)-bis (thiocyanato) cobalt (III) thiocyanate