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Synthesis, structural diversity, and thermal decomposition kinetics of four interpenetrating Zn(II)/Cd(II)/Ni(II) coordination polymers
Ist Teil von
Journal of solid state chemistry, 2019-05, Vol.273, p.141-149
Ort / Verlag
Elsevier Inc
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Four interpenetrating coordination polymers, namely, [Zn(bib)0.5(2,6-ndc)]n (1), {[Cd(bib)(2,6-ndc)]·2H2O}n (2), {[Cd2(bib)2(1,4-ndc)2]·H2O}n (3), [Ni2(bib)1.5(1,4-ndc)2(H2O)]n (4), (bib = 1,4-bis(2-methyl-imidazol-1-yl)butane, 1,4-H2ndc = Naphthalene-1,4-dicarboxylic acid, 2,6-H2ndc = Naphthalene-2,6-dicarboxylic acid) have been synthesized under solvothermal conditions. Their structures were characterized by elemental analysis, IR spectra, single-crystal and powder X-ray diffractions. Structural analyses reveal that compound 1 exhibits a 3-fold interpenetrating 3D net with pcu topology. Compound 2 presents a 5-fold interpenetrating 3D dia framework. Compound 3 displays an unusual [2 + 2] 4-fold interpenetrating 3D dia framework. Compound 4 features a 2-fold interpenetrating 3D framework. Simultaneous TG-DSC techniques were applied to assess the thermal decomposition behavior of compounds 1–4. TG measurements indicate that compounds show higher stability as the interpenetrating number increase. The thermal analysis kinetic parameters (apparent activation energy E and the pre-exponential factor A) of skeleton collapse for the compounds 1–4 were calculated by the methods of Kissinger and Ozawa-Doyle. The thermodynamic parameters (ΔH≠, ΔG≠, and ΔS≠) at peak temperatures were also calculated.
Four interpenetrating Zn(II)/Cd(II)/Ni(II) coordination polymers with different frameworks have been successfully constructed in the presence of flexible 1,4-bis(2-methyl-imidazol-1-yl)butane and two kinds of naphthalene acids. Thermodynamics and kinetics of the thermal decomposition for compounds 1–4 were investigated by simultaneous TG-DSC techniques. [Display omitted]