Acta Crystallographica Section B

Volume 44, Issue 1 pp. 16-22

Structural investigations of phosphorus–nitrogen compounds. 3. The structures of N₃P₃[O(CH₂)₃O](NC₄H₈)₄ and trans-N₃P₃[O(CH₂)₃O](NC₄H₈)₂Cl₂ and a comparison with N₃P₃[O(CH₂)₃O]Cl₄. The effect of replacing the electron-withdrawing chlorine atoms by electron-releasing pyrrolidino groups. P–O bond lengths and their relationship to spin–spin coupling constants, ³J(POCC)