Chelate metal complexes have been synthesised by reacting [MCODCl 2 ] (M=Pd, Pt) and 3,3,8,8-tetramethyl-1,6-dioxa-4,9-diaza-5λ 5 -phosphaspiro[4,4]nonane. The general formula of the products is cis-[MCl 2 L], where L is a P,N-bidentate coordinated P(III) form of the initial hydrophosphorane. The structure of the products was determined by IR, 1 H, 1 3 C, 1 4 N, 1 5 N, 3 1 P, and 1 9 5 Pt NMR spectroscopy, plasma and laser desorption mass spectrometry, sedimentation analysis, X-ray photoelectron spectroscopy and, in the case of platinum products, by single-crystal X-ray diffraction. A tendency of the complexes to reorganise in organic solvents was revealed. In the case of the palladium complex, the process is accompanied by an increase in the degree of nuclearity.