Hydrothermal Synthesis of Five New Coordination Polymers Based on Benzophenone‐2, 4′‐dicarboxylic Acid and N‐Donor Spacers

Abstract

Five new coordination polymers, namely, [Ni 2 (L) 2 (4,4Јbipy) 3 )]·H 2 O] n (1), [Ni 2 (L) 2 (O) (bpp) 2 ] n (2), [Zn(L)(bib) 0.5 ] n (3), [Zn(L)(PyBIm)] n (4), and [Zn 3 (L) 2 (OH)(im)] n (5) [H 2 L = benzophenone-2,4Ј-dicarboxylic acid, 4,4Ј-bipy = 4,4Ј-bipyridine, bpp = 1,3bis(4-pyridyl)propane, PyBIm = 2-(4-pyridyl)benzimidazole, and im = imidazole] were synthesized under hydrothermal conditions. Structure determination revealed that compound 1 is a 3D network and exhibits a 4-connected metal-organic framework with (4 2 .6 3 .8) topology, whereas 1512 compounds 2, 3, 4, and 5 are two-dimensional layer structures. In compounds 2-4, dinuclear metal clusters are formed through carboxylic groups. In compound 5, trinuclear metal clusters are formed through μ 3 -OH and carboxylic groups. The carboxylic groups exhibit three coordination modes in compounds 1-5: monodentately, bidentate-chelating, and bis-monodentately. Furthermore, the luminescent properties for compounds 3, 4, and 5 were investigated.[Zn(L)(bib) 0.5 ] n (3)Single-crystal X-ray reveals that complex 3 crystallizes in the triclinic space group P1. In the asymmetry unit, exists an independent Zn II ion, which is coordinated by four oxygen

A novel two-dimensional CdIIcoordination polymer: poly[aqua[μ4-2-(4-carboxylatobenzoyl)benzoato]cadmium(II)]

“…attributed to *-n or *transitions, as reported previously (Xu et al, 2012). Compound (I) exhibits a relatively strong emission band centred on $410 nm upon excitation at 290 nm ( Fig.…”

“…Organic ligands that contain carboxylic acid groups are frequently used in coordination polymers since the carboxylate group has an excellent coordination capability and flexible coordination patterns, which result in a wide diversity of structures. 2-(4-Carboxybenzoyl)benzoic acid (H 2 bpdc), an asymmetric V-shaped aromatic polycarboxylic acid derivative, has been used as a bridging ligand in the synthesis of novel coordination polymers (Chen et al, 2012;Hu et al, 2011Hu et al, , 2009Xu et al, 2012). Taking inspiration from the points mentioned above, we explored the self-assembly of the Cd II cation and H 2 bpdc under hydrothermal conditions, and obtained a novel two-dimensional coordination polymer, [Cd(bpdc)(H 2 O)] n , (I), and we now report its synthesis, crystal structure and physical properties.…”

Self-assembly of 1-D and 3-D transition-metal coordination polymers based on 4-(1H-l,3-benzimidazol-2-yl)pyridine 1-oxide

“…As shown in [Zn(4-PyHBIm)(oba)] (4-PyHBIm = 2-(4-pyridyl)benzimidazole, oba = 4,40-oxybis-(benzoate)) [2.076(4) Å−2.103(4) Å] [29]. Furthermore, the bond lengths of Zn−N in 3 are similar to those found in coordination polymers based on 2-(4-pyridyl)benzimidazole ligands [30]. Moreover, the bond lengths of Zn1−O1 and Zn1−Cl1 in 3 are 1.990(4) Å and 2.221(1) Å respectively.…”

Zinc(II) and Nickel(II) Complexes Based on Schiff Base Ligands: Synthesis, Crystal Structure, Luminescent and Magnetic Properties

“…Transition‐metal complexes are of unabated interest because of their fascinating structural topologies, such as poly‐nuclear clusters,1 one‐dimensional chains,2 two‐dimensional layers,3 and three‐dimensional frameworks especially MOFs (metal‐organic frameworks),4 and potential applications in a wide range of areas as functional materials including magnetism,5 luminescence,6 catalysis,7 sensors,8 nonlinear optics,9 and ion exchange 10. In general, the structural motifs and properties of these hybrid compounds are closely related to the metal centers and the coordinated multidentate ligands.…”