Abstract
<p>Eleven complexes and adduct have been synthesized and studied by infrared. The suggested structures are discrete with tetrahedral, trigonal bipyramidal, square planar or octahedral environments around Zn, Ni, Hg and Cu centres – the coordination number is eight in the yttrium compound and ten in the dysprosium one-. The maleate anion behaves as a bidentate, a monochelating, a bichelating or a tetradentate ligand while the formiate anion behaves as a monodentate ligand. For compounds containing a protonated amine or a methanol molecule, when hydrogen bonds are considered a supramolecular architecture may be obtained.</p>
Highlights
Maleic ammonium salts led to the formation of many complexes with metals such as, platine, copper, silver [14]
- For A, B, C, D and E, while considering the complex-anion, a dimeric structure with two external maleato anions behaving as monochelating ligands and two bridging halogen atoms, the environment around the metallic centre being square planar in the cases of Cu and Ni (Figure 1a) or tetrahedral in the case of Zn (Figure 1b)
Proposed structure for compounds B and E. - For F, a dimer similar to the one suggested in the previous zinc compound by replacing the bridging chlorides by bridging water molecules (Figure 2)
Summary
Maleic ammonium salts led to the formation of many complexes with metals such as, platine, copper, silver [14]. In the dynamic of our seeking new maleato organometallic compounds, we have initiated the interactions between (CyNH3)2O2C(CH)2CO2 or (iPr2NH2)2O2C(CH)2CO2 and MX2 or M’X3 (M = Cu, Zn, Hg, Ni; M’ = Dy, Y; X = Cl, Br).
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