Publication details
COORDINATION COMPOUNDS OF IRON (III), COBALT (II), AND NICKEL (II) WITH (1-AMINO-1-METHYL-ETHYL)PHOSPHONIC ACID AND A NEW SCHIFF BASE LIGAND
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| Year of publication | 2017 |
| Type | Conference abstract |
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| Description | In the last decade, there has been a great interest in the phosphonic acid-based molecular complexes and coordination polymers. Because the M-O-P bonds are stronger then the M-O-C bonds in carboxylates, phosphonates are widely used in the synthesis of different metal-organic materials, such as polynuclear metal phosphonates, layered compounds, and porous metal-organic frameworks,1 with a broad range of properties and different applications.2,3 Molecular phosphonates are very interesting objects, because such complexes can be applied as molecular precursors to MOF’s due to their stability. Mononuclear complexes or molecular clusters with paramagnetic metal cations are also very interesting compounds because of their magnetic properties. We synthesized and isolated new molecular complexes and coordination polymers of H2AIPA ((1-amino-1-methyl-ethyl)phosphonic acid) and Na2SAA (disodium (2-{[(E)-(2-oxidophenyl)methylidene]ammonio}propan-2-yl)phosphonate) ligands with Fe3+, Ni2+, and Co2+. Their properties were studied by a variety of physicochemical methods including structural analysis by the single-crystal X-ray diffraction method. Their magnetic properties were studied on a SQUID magnetometer. The most interesting results obtained in this study are the isolation and characterization of hexanuclear iron(III) phosphonate [Fe6(HAIPA)12(OH)6].nH2O, a 1D coordination polymer of Fe with the H2SAA ligand, a series of heptanuclear Co2+ phosphonates with a Star-of-David structural motif and related coordination polymers. A coordination polymer of Ni2+ with the H2SAA ligand was also isolated. Besides that, mononuclear isostructural complexes of Ni2+ and Co2+ with H2AIPA were obtained and characterized. The presence of non-coordinated amino groups in the complexes with H2AIPA and –OH groups in Co2+ complexes with Na2SAA makes these compounds potential precursors for the synthesis of new extended structures. Attempts of modification of [Co7(SAA)2(XSAA)4].nMeOH, X = H, Na, by SiCl4 were carried out. |
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