| Abstract: | A new zinc diphosphonate [NH3CH(CH3)CH2NH3]2Zn2(edbbp)2(HNO3)2·4H2O [eddbp?= O3PCH(Ph)NH(CH2)2NHCH(Ph)PO3] was hydrothermally synthesized with Zn(NO3)2·6H2O, ethane-1,2-diamino-N,N′-bis(benzylphosphonic acid) (H4edbbp) and 1,2-propyldiamine. It consists of a centro-symmetric dimeric unit [Zn2(edbbp)2], in which each zinc ion adopts a distorted square-pyramidal coordination geometry. Hydrogen bonds formed between phosphonate groups and protonated 1,2-propyldiamine molecules link the dimeric units into one-dimensional chains. The doubly protonated 1,2-propyldiamine molecules serve not only as charge compensating counter ions, but also as bridging groups. Hydrogen-bonding interactions among the phosphonate oxygen atoms, water molecules, nitric acid molecules and protonated 1,2-propyldiamine result in the formation of a three-dimensional supramolecular network. |
