1. Metal ions and solvents ratio co-regulate four new magnetic coordination polymers based upon an unsymmetric tricarboxylate acid ligand.
- Author
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Yuan-Pu Li, Ying Chai, Guo-Ping Yang, Hui-Hui Miao, Lin Cui, Yao-Yu Wang, and Qi-Zhen Shi
- Subjects
COORDINATION polymers ,METAL ions ,SOLVENTS ,CARBOXYLATES ,LIGANDS (Chemistry) ,HYDROGEN bonding ,SUPRAMOLECULAR chemistry - Abstract
Four new coordination polymers (CPs), [Co
3 (L)2 (bib)3 (EtOH)2 ]·2H2 O (1), [Mn3 (L)2 (bib)2 (H2 O)4 ]·4H2 O (2), [Ni(HL)(bib)(H2 O)3 ] (3) and [Ni3 (bib)4 (H2 O)10 ]·2(L)·12(H2 O) (4), were synthesized under solvothermal conditions with an unsymmetrical tricarboxylic acid ligand [biphenyl-3,3',5-tricarboxylic acid (H3 L)] in the presence of the 1,4-bis(1H-imidazol-4-yl)benzene (bib) ligand. In compound 1, tricarboxylate acid ligands (H3 L) link Co centers to generate two-dimensional (2D) layers which are further connected by bib ligands to exhibit a three-dimensional (3D) framework with a (4,4,5)-connected (4²·6³·8)2 (4²·67 ·8)2 (64 ·8·10) topology. The three-dimensional (3D) framework of 2 is defined as a (3,3,4)-connected topology with the point symbol of (6·8²)2 (6²·8)2 (8·104 ·12). Compound 3 contains a one-dimensional (1D) left-hand helix chain along the a direction and further extends into a 2D supramolecular network and a 3D supramolecular framework via hydrogen bonds. Compound 4 displays a one-dimensional (1D) molecular ladder, which is further combined with each other through π...π stacking to extend into 2D supramolecular sheets. The supramolecular networks of 3 and 4 resulted from the different solvent ratios [V(H2 O)-V(EtOH)] in the reaction. All the CPs are characterized by single-crystal X-ray diffraction analyses, powder X-ray diffraction (PXRD), elemental analyses, IR spectroscopy, and TGA analyses. Moreover, the weak ferromagnetic properties of 2 and 3 and antiferromagnetic properties of 1 and 4 have also been investigated. [ABSTRACT FROM AUTHOR]- Published
- 2014
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