Three Co(II)-coordination polymers based on 5-tert-butyl isophthalic acid and isomeric Bis(imidazole) ligands: Synthesis, optical and magnetic properties. (1st March 2018)

• Record Type: Journal Article
• Authors: Arıcı, Mürsel; Yeşilel, Okan Zafer; Büyükgüngör, Orhan; Yerli, Yusuf
• Is Part Of: Polyhedron. Volume 142(2018)
• Page Start: 9
• Page End: 15
• Publication Date: 2018-03-01
• Subjects: 5-tert-Butyl isophthalate -- Co(II)-coordination polymer -- Semi-flexible bis(imidazole) linkers -- Magnetism; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2017.12.028
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Three Co(II)-coordination polymers were systematically synthesized with H2 tbip and isomeric bis(imidazole) linkers under hydrothermal conditions and characterized by various thecniques. The tbip ligand displayed five different coordination modes in its complexes. In 1–3, trimetallic [Co3 (COO)6 (OH2 )] and [Co3 (COO)6 ] units and dimeric [Co2 O2 ] units were connected by tbip linkers to form 1D, 2D and 3D structures which were extended to form 2D and 3D structures by neutral ligands. Complex3 exhibited 3D + 3D → 3D interpenetrated framework with crs/dia-e topology. Moreover, thermal, optical and magnetic properties of the complexes were also studied. Abstract: Three new Co(II)-coordination polymers, namely {[Co3 (µ3 -tbip)(µ4 -tbip)(µ4 -tbip)(µ-H2 O)(µ-obix)]·3H2 O} n (1), [Co3 (Htbip)(µ-Htbip)(µ4 -tbip)(µ4 -tbip)(H2 O)(µ-mbix)] n (2) and [Co2 (µ3 -tbip)2 (µ-pbix)] n (3) (tbip: 5- tert -butyl isophthalate, o, m, pbix: 1, X-bis(imidazol-1ylmethyl)benzene, X = 2, 3, 4) were systematically synthesized with H2 tbip and isomeric bis(imidazole) linkers under hydrothermal conditions to investigate the influence of isomeric ligands on the structural diversity. They were characterized by elemental analysis, IR spectroscopy, single and powder X-ray diffractions. X-ray results showed that complexes1 and3 possessed 3D framework while complex2 was 2D layer. In1 and2, trinuclear [Co3 (COO)6 (OH2 )] and [Co3 (COO)6 ] units were connected by tbip ligands to form 2D and 1D structures which were extended to form 3D and 2D structures by neutral ligands, respectively. Complex3 was mutually interpenetrated each other to form 3D + 3D → 3D interpenetrated framework with crs/dia-e topology. In2, tbip ligand displayed new coordination modes. Moreover, thermal, optical and magnetic properties of the complexes were also studied.