SYNTHESIS AND PROPERTIES OF THE COMPLEX (DIPY)NI(ETA(2)PHC(2)SIME(3))- CORRELATION OF STRUCTURAL BOND PARAMETERS WITH IR AND NMR SPECTROSCOPIC DATA IN TRANSITION-METAL ALKYNE COMPLEXES

The reaction of (dipy)Ni(cod) with PhC drop CSiMe(3) yields, depending on the stoichiometry, first the binuclear complex (dipy)Ni(mu-PhC(2)S iMe(3))Ni(dipy) (2) which gives, with an excess of the alkyne, the mon onuclear compound (dipy)Ni(eta(2)-PhC(2)SiMe(3)) (3). This complex was structurally characterized to study the influence of the dipy ligand on alkyne complexation in Ni(0) complexes. Furthermore, comparison of spectroscopical and structural data in a series of complexes with one alkyne: (dipy)Ni(eta(2)-PhC(2)siMe(3)) (3), (Ph(3)P)(2)Ni(eta(2)-PhC(2 )SiMe(3)), Cp(2)Ti(eta(2)-PhC(2)SiMe(3)) and Cp(2)Ti(eta(2)-PhC(2)SiM e(3)) has shown that C-13-NMR and infrared spectroscopy are better sui ted to characterize the complexation of an alkyne (two- or four-electr on donor) at the metal atom than X-ray structure analysis.