Ligand isotope studies of Zeise's salt derivatives (and their CO analogues) with some aza-heterocycles and their N-oxides. II : Their preparation, characterisation, and use in developing 1H nmr and infrared spectra as a diagnostic tool

Article abstract of DOI:10.1016/0584-8539(92)80050-7

Forty-one ?-acid complexes of the type cis-A)X2>X and trans-A)X2> (A = C2H4, CO; X = Cl, Br; L = pyridazine , pyrazine N-oxide , quinoline , quinoline N-oxide , 2,2'-bipyridine , 1,10-phenanthroline ) and their deuterated L and C2D4 analogues have been characterised employing infrared and 1H nmr spectroscopy.The employment of ν₁₂ (CH2 scissors ca. 1460 cm^-1) of η²-ethene as a diagnostic probe in distinguishing between 4- and 5-coordination is proposed, while the summed percentage decrease of ν₂+ν₃ (νC=C/δCH2) may be used to distinguish between N- and O-coordination.The use of chemical shifts (1H nmr spectroscopy) is confirmed as a suitable means to distinguish between 4- and 5-coordination and is also shown to be suitable for distinction between N- and O-coordination in four coordinate Pt(II) η²-ethene complexes.In contradiction of previous reports, it is found that J_Pt-H cannot be employed to determine the coordination number.