Supramolecular Hydrogen‐Bonded Frameworks from a New Bisphosphonic Acid and Transition Metal Ions |
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Authors: | Prof Khodayar Gholivand Ali Reza Farrokhi |
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Institution: | Faculty of Chemistry, Tarbiat Modares University, Tehran, R. Iran |
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Abstract: | The reaction of 2‐morpholinoethylimino‐bis(methylenephosphonic acid) (H4L) with cobalt(II), nickel(II) acetate, and cadmium(II) chloride in ethanol/water mixed solvents afforded three new crystal‐engineered supramolecular metal phosphonates, Co(H3L)2 · 2H2O ( 1 ), Ni(H3L)2 · 2H2O ( 2 ), and Cd2Cl4(H2O)6]0.5H4L] ( 3 ) by using a layering technique. The cobalt(II) ions in complex 1 are hexacoordinated by four phosphonate oxygen atoms and two imino nitrogen atoms. The mononuclear units of complex 1 are connected through hydrogen bonds to form a three dimensional supramolecular network. The structure of compound 2 is analogous to that of 1 except that the cobalt(II) ion in compound 1 is replaced by nickel(II) in compound 2 . In the molecular structure of compound 3 , cadmium is coordinated to three chloride ions and three aqua oxygen atoms to form a novel neutral dinuclear complex. Several hydrogen bonds connect the dinuclear complex and the neutral form of the ligand to build a supramolecular three dimensional structure. |
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Keywords: | Bisphosphonic acid Cadmium Cobalt Nickel Supramolecular structures X‐ray diffraction |
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