Molecular Packing Variation of Crimpled 2D Layers and 3D Uncommon 6⁵.8 Topology: Effect of Ligand on the Construction of Metal−Quinoline-6-carboxylate Polymers

Abstract

Four coordination polymers Ni(quin-6-c) 2 (1), Zn 2 (quin-6-c) 4 (2), Co 2 (quin-6-c) 4 (3), and Zn(OH)(quin-6-c) (4) (quin-6-c ) quinoline-6-carboxylate) have been synthesized by methods of hydrothermal reaction and their crystal structures determined. In the compound 1, quin-6-c ligands act as ditopic linkers bound to Ni atoms, resulting in the formation of an unusually wavelike 2D (4,4) net. The adjacent layers are stacked offset with respect to each other, in an ABAB fashion. Compounds 2 and 3 are isostructural and feature a unique 2D molecular network composed of crimpled double-line ribbons. The 2D layers stack in a rare, interesting ABCD pattern along the crystallographic c axis. Compound 4 forms a novel 3D framework based on uncommon "new" 6 5 .8 topology, crystallizes in the acentric orthorhombic space group Pna2 1 and displays powder SHG intensity ca. 460 times in comparing with that of R-quartz. The [Zn(µ 2 -OH)] n helical chains connected to each other through unsymmetrical quin-6-c ligands in 4 have ensured its acentricity and SHG-activity. A discussion of the crystal structures, as well as the coordination properties of quin-6-c ligands upon different geometries of the central ions, is provided.

Structures and Photoluminescence Properties of Four Cadmium(II) Coordination Polymers Synthesized by Rigid Ligands and N-Donor Ligands

“…Coordination polymers with a topology of 4 based on tetrahedral nodes belong to the dia topology. [14] It is worth mentioning that 4 has large cages, thereby showing a possibility that the structures usually interpenetrate in order to satisfy close-packing. [15] As can be seen, the cages exhibit large voids that allow the other independent equivalent frameworks to interpenetrate the cage through Hopf links, still resulting in an infinite 2-fold interpenetrating 3D network structure (Fig.…”

Poly[(μ3-quinoline-6-carboxylato-κ3 N:O:O′)silver(I)]

“…For background to coordination polymers with organic ligands, see: Kitagawa et al (2004); Chiang et al (2008); Yeh et al ( , 2009; Hsu et al (2009). For related pyridinecarboxylate structures, see: Yeh et al (2004); Ockwig et al (2005); Chen et al (2008); Hirano et al (2002) and for related 6-quinolinecarboxylate structures, see: Lin & Maggard (2007); Du et al (2008a,b); Hu et al (2008); Xu et al (2009).…”

“…In the past, the pyridinecarboxylate ligands have been subjected to many studies of its coordination ability to metal centers (Yeh et al, 2004;Ockwig et al, 2005;Chen et al, 2008;Hirano et al, 2002). The various metal complexes containing 6-quinolinecarboxylate (L-) ligands have been reported, which show various multi-dimensional frameworks (Lin & Maggard, 2007;Du et al, 2008a,b;Hu et al, 2008;Xu et al, 2009). The Ag + cations are coordinated with two N atoms from two 1,2-bis…”

Lead(II) Hybrid Materials from 3‐ or 4‐Phosphonobenzoic Acid

“…Several heterodifunctional molecules have been already used for the design of hybrid structures and several of them can be classified among the rigid molecules (e.g. pyridine-carboxylic acid, [12] bipyridine-polycarboxylic acid, [13] pyridinephosphonic acid, [14] carboxypyridine oxide, [15] imidazolecarboxylic acid, [16] quinolinecarboxylic acid, [17] benzimidazolecarboxylic acid, [18] phosphonic acid-sulfonic acid, [19] phosphonic acid-carboxylic acid [20] ). On our side, we have investigated the use of 3-phosphonobenzoic acid as a rigid organic building block.…”