A novel trinuclear zinc metal-organic network: Synthesis, X-ray diffraction structures, spectroscopic and biocompatibility studies

被引:14
|
作者
Geranmayeh, Shokoofeh [1 ]
Abbasi, Alireza [1 ]
Zarnani, Amir-Hassan [2 ,3 ]
Skripkin, Mikhail Yu. [4 ]
机构
[1] Univ Tehran, Sch Chem, Coll Sci, Tehran, Iran
[2] Acad Ctr Educ Culture & Res ACECR, Nanobiotechnol Res Ctr, Avicenna Res Inst, Tehran, Iran
[3] Iran Univ Med Sci, Immunol Res Ctr, Tehran, Iran
[4] St Petersburg State Univ, Dept Gen & Inorgan Chem, St Petersburg 198504, Russia
关键词
Metal-organic network; X-ray diffraction; Trinuclear zinc; Terephthalic acid; CRYSTAL-STRUCTURES; COORDINATION POLYMERS; FRAMEWORKS; LIGAND; CARBOXYLATES; ACID;
D O I
10.1016/j.poly.2013.05.030
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Crystal structure and vibrational spectra of a new zinc metal-organic network, {[Zn-3(tp)(4)]center dot 4H(2)O}(n), 1, have been studied. The compound was constructed from Zn(NO3)(2)center dot 6H(2)O and H(2)tp ligand (H(2)tp = 1,4-benzen-edicarboxylic acid) by solvothermal synthesis in DMF. Its framework is built from the trinuclear SBUs as eight-connected nodes and tp ligands as spacers. Each node consists of three Zn-II ions that are in a linear arrangement with Zn center dot center dot center dot Zn distance of 3.271 angstrom. The distorted octahedral middle Zn atom is connected to six oxygen atoms (Zn-O = 2.036-2.252 angstrom) belonging to six different tp carboxylate group. Each of the two terminal Zn atoms is coordinated by four oxygen atoms (Zn-O = 1.952-1.986 angstrom) belonging to four carboxylate groups of tp ligands. Normal-coordinated analysis of the vibrational spectra together with force field calculations for Zn(O2CC)(n) (n = 4 or 6) entities which is the most affected by coordination effect have been performed. The results show consistency of the lower values of force constants for ZnO6 entity compare to ZnO4 that could be related to the stronger inter-ligand repulsion in octahedron compare to tetrahedron. In-situ PXRD patterns show two gradual structural transformations from ambient to 400 degrees C and a new ZnO phase is formed between 400 and 500 degrees C that are in a good agreement with thermal gravimetric analysis. Photoluminescence measurement in the solid state shows an emission at 420 nm which is in accordance with other zinc carboxylate MOFs. The potential cytotoxicity of 1 was evaluated on human amniotic epithelial cells (hAECs) by XTT assay. The results clearly showed that this compound exerted little in vitro cytotoxic effect in a wide range of concentration and time intervals. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6 / 14
页数:9
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