Constructing two 1D coordination polymers and one mononuclear complex by pyrazine- and pyridinedicarboxylic acids under mild and sonochemical conditions: magnetic and CSD studies. Issue 26 (12th June 2018)

• Record Type: Journal Article
• Authors: Hassanpoor, Azam; Mirzaei, Masoud; Eshtiagh-Hosseini, Hossein; Majcher, Anna
• Is Part Of: CrystEngComm. Volume 20:Issue 26(2018)
• Page Start: 3711
• Page End: 3721
• Publication Date: 2018-06-12
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c8ce00573g
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Two 1D coordination polymers and one mononuclear complex were synthesized. Nanostructures of the CPs were prepared by a sonochemical method. Abstract : In this work, we report the synthesis and crystal structure of two 1D coordination polymers and one mononuclear complex based on pyrazine-2, 3-dicarboxylic acid (H2 pyz-2, 3-dc), pyridine-2, 3-dicarboxylic acid (H2 py-2, 3-dc) and pyridine-2, 6-dicarboxylic acid (H2 py-2, 6-dc) ligands, namely {[2-Hatz]2 [Cu(pyz-2, 3-dc)2 ]} n (2-atz = 2-aminothiazole) (1 ), {[2-Hatz]2 [Cu(py-2, 3-dc)2 ]} n (2 ) and [Cu(py-2, 6-dc)(2-atz)(H2 O)] (3 ). Single crystal X-ray diffraction analyses showed that utilizing different structural isomers (2, 3- and 2, 6-) of dicarboxylic acid led to geometrical and structural diversity. Two coordination polymers have a distorted octahedral geometry, in which the (pyz-2, 3-dc) 2− and (py-2, 3-dc) 2− moieties act as tridentate bridging ligands in1 and2 so that 1D chains are in a similar fashion, while complex3 exhibits a 3D supramolecular network with a square pyramidal geometry. Moreover, to investigate the influence of particle size on physical properties such as magnetic behavior and thermal stability, nanostructures of the mentioned polymers were synthesized by a sonochemical method and characterized by scanning electron microscopy (SEM), elemental analyses, powder X-ray diffraction (PXRD), infrared spectroscopy (IR), and thermogravimetric (TGA) analyses. Investigation of the magnetic properties of compounds1, 2 and the corresponding nanostructures indicates that there are weak antiferromagnetic interactions between the Cu II ions in the temperature range of 1.8–300 K.