Seven 3d-4f coordination polymers of macrocyclic oxamide with polycarboxylates: Syntheses, crystal structures and magnetic properties
| Autor: | Yan-Feng Zheng, Na Xin, Yan-Yan Xu, Ya-Qiu Sun, Guo-Ying Zhang, Dong-Zhao Gao |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
010405 organic chemistry Stereochemistry Oxamide Polymer Crystal structure 010402 general chemistry Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Ion Inorganic Chemistry Crystallography chemistry.chemical_compound chemistry Materials Chemistry Ceramics and Composites NIP Physical and Theoretical Chemistry |
| Zdroj: | Journal of Solid State Chemistry. 243:267-275 |
| ISSN: | 0022-4596 |
| Popis: | Seven new 3d–4f heterometallic coordination polymers, [Ln(CuL)2(Hbtca)(btca)(H2O)]·2H2O (Ln = TbIII 1, PrIII 2, SmIII 3, EuIII 4, YbIII 5), [Nd(NiL)(nip)(Rnip)]·0·25H2O·0.25CH3OH (R= 0.6CH3, 0.4H) 6 and [Nd2(NiL)(nip)3(H2O)]·2H2O 7(CuL or NiL, H2L = 2, 3-dioxo-5, 6, 14, 15-dibenzo-1, 4, 8, 12-tetraazacyclo-pentadeca-7, 13-dien; H2btca = benzotriazole-5-carboxylic acid; H2nip = 5-nitroisophthalic acid) have been synthesized by a solvothermal method and characterized by single-crystal X-ray diffraction. Complexes 1–5 exhibit a double-strand meso-helical chain structures formed by [LnIIICuII2] units via the oxamide and benzotriazole-5-carboxylate bridges, while complex 6 exhibits a four-strand meso-helical chain formed by NdNi unit via the oxamide and 5-nitroisophthalate bridges. Complex 7 consists of a 2D layer framework formed by four-strand meso-helical chain via the nip2− bridges. Moreover, the magnetic properties of them were investigated, and the best-fit analysis of χMT versus T show that the anisotropic contribution of Ln(III) ions (arising from the spin-orbit coupling or the crystal field perturbation) dominates (weak exchange limit) in these complexes(for 3, λ = 214.6 cm−1, zj’ = −0.33 cm−1, gav = 1.94; for 5, Δ = 6.98 cm−1, zj’ = 1.53 cm−1, gav = 1.85). |
| Databáze: | OpenAIRE |
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