Die Bindungsverhältnisse in Phosphantelluriden. Eine empirische NMR-Studie und die Kristallstruktur von (iso-C3H7)3PTe [1] / The Nature of the Bonding in Phosphane Tellurides. An Empirical NMR Study and the Crystal Structure of (iso-C3H7)3PTe [1]

31P and 125Te NMR data of trialkylphosphane tellurides are compared. The deviation of the shifts for Me3PTe and 'Bu3PTe from those of other phosphane tellurides is interpreted in terms of high s-character of the P–Te bond originating from the phosphorus (R = Me) and the tellurium (R = 'Bu) atom, respectively. The molecular structure of 'Pr3PTe has been determined by X-ray crystallography (P–Te 2.365 A). A reduction of the bond order is suggested based also on a comparison of the R3PSe and R3PTe NMR data.