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In N,N′-di-tert-butyl-N′′,N′′-dimethyl­phosphoric triamide, C10H26N3OP, (I), and N,N′,N′′,N′′′-tetra-tert-but­oxy­bis(phos­phonic diamide), C16H40N4O3P2, (II), the extended structures are mediated by P(O)...(H—N)2 inter­actions. The asymmetric unit of (I) consists of six independent mol­ecules which aggregate through P(O)...(H—N)2 hydrogen bonds, giving R21(6) loops and forming two independent chains parallel to the a axis. Of the 12 independent tert-butyl groups, five are disordered over two different positions with occupancies ranging from 1 \over 6 to 5 \over 6. In the structure of (II), the asymmetric unit contains one mol­ecule. P(O)...(H—N)2 hydrogen bonds give S(6) and R22(8) rings, and the mol­ecules form extended chains parallel to the c axis. The structures of (I) and (II), along with similar structures having (N)P(O)(NH)2 and (NH)2P(O)(O)P(O)(NH)2 skeletons extracted from the Cambridge Structural Database, are used to compare hydrogen-bond patterns in these families of phospho­ramidates. The strengths of P(O)[...H—N]x (x = 1, 2 or 3) hydrogen bonds are also analysed, using these compounds and previously reported structures with (N)2P(O)(NH) and P(O)(NH)3 fragments.
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