期刊
JOURNAL OF COORDINATION CHEMISTRY
卷 68, 期 20, 页码 3599-3610出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2015.1077953
关键词
Mixed-ligand complex; Pyridine-2,6-dicarboxylic acid; 8-Aminoquinoline; Self-assembly; pi-pi Stacking interaction; Hydrogen bonding
资金
- Tulane Crystallography Laboratory, NSF-MRI [1228232]
- MINECO of Spain [CTQ2014-57393-C2-1-P, CSD2010-0065]
Self-assembly of pyridine-2,6-dicarboxylic acid (H(2)py-2,6-dc) and CrCl3 center dot 6H(2)O in the presence of 8-aminoquinoline as a N-donor co-ligand leads to the formation of a supramolecular coordination compound in which the cationic and anionic complexes differ in composition, namely [Cr(py-2,6-dc)(8-aq)(H2O)][Cr(py-2,6-dc)(2)]center dot 2H(2)O (1). Single-crystal X-ray analysis reveals that the coordination sphere around Cr in the cationic complex consists of one (py-2,6-dc)(2-), one 8-aq, and one H2O while the anionic complex is more symmetrical and has two (py-2,6-dc)(2-) ligands in its coordination environment. Both Cr centers are six coordinate with distorted octahedral geometries. The ionic coordination motifs in 1 are held together by intermolecular O-H center dot center dot center dot O, N-H center dot center dot center dot O, and C-H center dot center dot center dot O hydrogen bonding as well as C-O center dot center dot center dot pi, C-H center dot center dot center dot pi, and pi-pi stacking interactions to produce extended 2-D architectures. We have analyzed the pi-pi stacking interactions by DFT calculations focusing our attention on the influence of the anionic/cationic nature of the complex.
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