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The NMR parameters ( 1 H,  13 C,  31 P,  195 Pt) of compounds of the type cis- and trans- [M(C≡C-R)2(PR′ 3 ) 2 ] (M = Ni, Pd, Pt) are reported. The chemical shifts δ 13 C (M-C≡C; R) and δ 195 Pt (together with UV data) indicate the presence of π-backbonding from the metal into π* C≡C  the orbitals. This also explains some unusual features of the coupling constants J(≡ 13 C 1 H), J( 13 C≡ 13 C) and J( 195 Pt 13 C≡). The NMR parameters reflect an increase in the amount of π-backbonding for Pt &lt; Pd &lt; Ni.

zeitschrift für naturforschung b

Kernresonanzspektroskopische Untersuchungen ( 1 H-,  13 C-,  31 P-,  195 Pt-NMR) an Alkinyl-Komplexen von Pt II , Pd II  und Ni II  / Nuclear Magnetic Resonance ( 1 H-,  13 C-,  31 P-,  195 Pt-NMR)-Studies of Alkynyl Derivatives of Pt II , Pd II  and Ni II