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Transition Metal Coordination Polymers with Trans-1,4-Cyclohexanedicarboxylate: Acidity-Controlled Synthesis, Structures and Properties.

ABSTRACT: Five trans-1,4-cyclohexanedicarboxylate (chdc2-) metal-organic frameworks of transition metals were synthesized in aqueous systems. A careful control of pH, reaction temperature and solvent composition were shown to direct the crystallization of a particular compound. Isostructural [Co(H2O)4(chdc)]n (1) and [Fe(H2O)4(chdc)]n (2) consist of one-dimensional hydrogen-bonded chains. Compounds [Cd(H2O)(chdc)]n?0.5nCH3CN (3), [Mn4(H2O)3(chdc)4]n (4) and [Mn2(Hchdc)2(chdc)]n (5) possess three-dimensional framework structures. The compounds 1, 4 and 5 were further characterized by magnetochemical analysis, which reveals paramagnetic nature of these compounds. A presence of antiferromagnetic exchange at low temperatures is observed for 5 while the antiferromagnetic coupling in 4 is rather strong, even at ambient conditions. The thermal decompositions of 1, 4 and 5 were investigated and the obtained metal oxide (cubic Co3O4 and MnO) samples were analyzed by X-ray diffraction and scanning electron microscopy.

SUBMITTER: Demakov PA 

PROVIDER: S-EPMC7014088 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Transition Metal Coordination Polymers with Trans-1,4-Cyclohexanedicarboxylate: Acidity-Controlled Synthesis, Structures and Properties.

Demakov Pavel A PA   Bogomyakov Artem S AS   Urlukov Artem S AS   Andreeva Aleksandra Yu AY   Samsonenko Denis G DG   Dybtsev Danil N DN   Fedin Vladimir P VP  

Materials (Basel, Switzerland) 20200119 2

Five trans-1,4-cyclohexanedicarboxylate (chdc<sup>2-</sup>) metal-organic frameworks of transition metals were synthesized in aqueous systems. A careful control of pH, reaction temperature and solvent composition were shown to direct the crystallization of a particular compound. Isostructural [Co(H<sub>2</sub>O)<sub>4</sub>(chdc)]<sub>n</sub> (<b>1</b>) and [Fe(H<sub>2</sub>O)<sub>4</sub>(chdc)]<sub>n</sub> (<b>2</b>) consist of one-dimensional hydrogen-bonded chains. Compounds [Cd(H<sub>2</sub>  ...[more]

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