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A systematic natural abundance  15 N NMR study of diazaphospholes is presented for the first time, giving accurate values for chemical shifts, δN , and coupling constants J( 31 P 15 N), J( 15 N 1 H ).  14 N NMR spectra can be used to predict the magnitude of  1 J(  31 P 14 N) if the broadening of the  31 P resonance by scalar relaxation is known. The relaxation behaviour of the  14 N nuclei corresponds to that found in azoles indicating a comparable electronic ground state structure. The comparison of the chemical shifts, δN, in the diazaphospholes with δN of corresponding triazoles reveals differences which can be traced to the N-P σ-bonds and to the influence o f the phosphorus atom on the π-system. A linear correlation δN/δP exists coordinate nitrogen and phosphorus, respectively.

zeitschrift für naturforschung b

14 N- und  15 N-NMR-Spektroskopie von Diazaphospholen und die lineare Korrelation der chemischen Verschiebung von zweifach koordiniertem N und P /  14 N and  15 N NMR Spectroscopy of Diazaphospholes and the Linear Correlation of the Chemical Shift of Two-Coordinate N and P