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Issue 24, 2002
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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

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Abstract

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(II) ion, the diphosphonic acid acts as a tetradentate chelating ligand (2N, 2O), forming Ni(H2L)(H2O)22 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 μ2-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.

Graphical abstract: 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

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Publication details

The article was received on 01 Jul 2002, accepted on 14 Oct 2002 and first published on 12 Nov 2002


Article type: Paper
DOI: 10.1039/B206343N
Citation: J. Chem. Soc., Dalton Trans., 2002,0, 4541-4546
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    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

    J. Mao, Z. Wang and A. Clearfield, J. Chem. Soc., Dalton Trans., 2002, 0, 4541
    DOI: 10.1039/B206343N

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