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This work relates to the mass spectroscopic study of twelve square planar Pt(I1) complexes of the general structure I P t &L2P(CH2)nPR21 X21, wherein R = M e , n = 2 (DMPE), n = 3 (DMPP); R = E t , n = 2 (DEPE), n = 3 (DEPP); X = CI, B r , 1. Results obtained are as follows: (1) the molecular ion is observable in all the spectra, (2) in the region m/e > 194, the peak for the (M-X)+ ion shows maximum intensity, (3) the smallest ion containing a coordination bond observable in all spectra is the (PtP2)+ ion, (4) an appropriate mass spectroscopic fragmentation pattern can be given for ions containing the platinum atom and it is possible to gain information regarding the type of coordination bonds and t r a n s influence of the diphosphine ligands by comparing the percent contribution of certain ions to the total ionization. (5)While i t is possible to study organic compounds easily spectroscopy, the application of this method to Coordination w i t h mass compounds a57 858 SARIKAHYA AND SARIKAHYA is limited by virtue of their large molecular masses due to their m e t a l content, t!ieir difficulty in conversion to the gaseous s t a t e and possible