Investigation of structural, spectral and thermal properties of one-dimensional polymer containing pyromellitic acid and isonicotinamide

• Published in: Journal of molecular structure Vol. 1176; pp. 685 - 694
• Main Authors: Aycan, Tuğba, Öztürk, Filiz, Paşaoğlu, Hümeyra
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.01.2019
• Subjects: Coordination polymer; Pyromellitic acid; Single crystal X-ray diffraction; Spectroscopic methods; Single crystal X-ray diffraction; Spectroscopic methods; Pyromellitic acid; Coordination polymer
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2018.08.109

The coordination polymer with mixed ligand [Cu2(H2O)2 (pm) (ina)2]n.3nH2O (pm = tetraanion of pyromellitic acid, ina = isonicotinamide) was studied mostly on its supramolecular architecture. Single crystals were synthesized and structural properties of the 1D polymer were characterized by Single Crystal X-ray diffraction (SCXRD), different spectroscopic methods (Infrared (IR) spectroscopy, UV–Vis spectroscopy and EPR spectroscopy), Thermal and Elemental analysis. It has been observed that complex has crystallized in the monoclinic space group P21/c. The geometric environment of Cu(II) ion is five-coordinated in slightly distorted square pyramidal geometry and τ value have found 0.13. The pyromellitate ligands connecting the metal centers act as bridge and form 1D polymer chains of 2,4 ribbon type [1]. The ladder-like polymer is connected by OH⋯O and NH⋯O hydrogen bonds to form supramolecular building. This complex consists of a 3D polymeric structure with containing planar hexacyclic and dimeric water rings. It was mainly focused on the characteristic (COO)as and (COO)s stretching vibrations of pyromellitate anion in the FT-IR investigation of the complex. [Display omitted] •Synthesis of a new 1D coordination polymer of Cu(II) with mixed ligands.•Examining the molecular and spectroscopy structure of complex and ligands.•Investigation of single crystal X-ray diffraction, Elemental analysis, TGA, FT IR, EPR and UV–Vis spectra.•Pyromellitate acts as bridging ligand binding Cu(II) metal center via four carboxylate O atom.•The hydrogen bonding results in 3D supramolecular structure.