Hydrogen Bond Supported Metal Assembled Compounds of Chloranilic acid

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Design and synthesis of molecular based materials is a booming field of research in crystal engineering. Hydrogen bonding interaction is one of the active tools to construct metal organic suprastructures. In this context, usage of mixed organic ligands helps to get predictable molecular architecture having potential properties such as magnetism, conductivity and non-linear optics.Chloranilic acid is one the member of oxocarbon family provides 1D chains and 2D layers with various metal ions. We have synthesized iron assembled compound of chloranilic acid, {[Fe(CP*)ィイD22ィエD2][Fe(CA)ィイD22ィエD2(HィイD22ィエD2O)ィイD22ィエD2]}<D2n>D2 (1) (HィイD22ィエD2CA = chloranilic acid, Cp*ィイD1-ィエD1 = decamethyl cyclopentadienide) and Cu and Zn assembled compounds of chloranilic acid and tptz, {[M(CA)(tptz)(HィイD22ィエD2O)](HィイD22ィエD2O)} (tptz = 2,4,6-tris(2-pyridyl)-l,3,5,-triazine, M = CuィイD12+ィエD1 (2), ZnィイD12+ィエD1 (3). Here the crystal structures of the three compounds are described.Compound 1 consists of 2D anionic layer {[Fe(CA)ィイD22ィエD2(HィイD22ィエD2O)ィイD22ィエD2]ィイD1-ィエD1}n and [Fe(CP*)ィイD22ィエD2]ィイD1+ィエD1 guest cations. The geometry around the iron(III) ion in the layer is a distorted octahedron, where four oxygen atoms from two CAィイD12-ィエD1 and two oxygen atoms from two water molecules are coordinated (Fig. 1). The octahedral units make 2D layer by hydrogen bonding interaction, which occurs between the terminal oxygen atoms of CAィイD12-ィエD1 and the coordinated water molecules. The [Fe(CP*)ィイD22ィエD2]ィイD1+ィエD1 cations are intercalated between the layers by electrostatic interaction.Compound 2 and 3 are isomorphous and are made of CAィイD12-ィエD1 and tptz coordinated octahedral building units, which make 1D chains by hydrogen bonding interaction. Each metal ion is coordinated by two oxygen atoms from one CAィイD12-ィエD1, three nitrogen atoms from one tptz and one oxygen from a water molecule. Interstitial water molecules are included by hydrogen bonding interaction.