Building layered structures from hydrogen bonded molecular units and 1D metal phosphonate chains: synthesis, characterization and crystal structures of N,N '-dimethyl-N,N '-ethylenediamine-bis(methylenephosphonic acid), its Ni(II) and Pb(II) complexes

作者：Mao JG; Wang ZK; Clearfield A^*

来源：Journal of the Chemical Society. Dalton Transactions, 2002, (24): 4541-4546.

DOI：10.1039/b206343n

The diphosphonic acid, N,N'-dimethyl-N,N'-ethylenediamine-bis(methylenephosphonic acid) (H4L) 1, along with its Ni(II) and Pb(II) complexes, have been synthesized and structurally determined. The structure of the diphosphonic acid features a 2D layer built from the molecular units interconnected by hydrogen bonds between phosphonate oxygen atoms and/or nitrogen atoms. Upon complexing with the Ni() ion, the diphosphonic acid acts as a tetradentate chelating ligand (2N, 2O), forming Ni(H2L)(H2O)(2) 2 molecular units, such units are also interconnected into a hydrogen bonded double layer via hydrogen bonds between uncoordinated phosphonate oxygen atoms. The ligand in Pb(H2L) 3 also chelates with a Pb(II) ion tetradentately, however, neighboring Pb(H2L) units are interconnected into a one-dimensional chain along the c-axis by a pair of mu(2)-chelating and bridging phosphonate oxygen atoms. Such chains are further interconnected into a 3D network via hydrogen bonds between uncoordinated phosphonate oxygen atoms. These structures demonstrate the important role of hydrogen bonds in the chemistry of divalent metal phosphonates.

• 出版日期2002