Ni(II) Coordination Polymers Constructed from the Flexible Tetracarboxylic Acid and Different N-Donor Ligands: Structural Diversity and Catalytic Activity

Abstract

To seek the effect condition of the complexes on the manufacture of the biaryl compounds, seven Ni(II) complexes, namely, {[Ni(L) 0.5 (bpa)(H 2 O)]·2H 2 O} n (1), {[Ni 2 (L)(dpp) 2 (H 2 O)]·4H 2 O} n (2), {[Ni(L) 0.5 (pbmb)(H 2 O)]·H 2 O} n (3), {[Ni 2 (L)(bmp) 2 (H 2 O)]·7H 2 O} n (4), {[Ni(L) 0.5 (pbib) 1.5 ]·2H 2 O} n (5), {[Ni 2 (L)(pbib) 1.5 ]·3H 2 O} n (6) and [Ni(L) 0.5 (beb) 2 (H 2 O)] n (7) (bpa = 1,2-bis(4-pyridyl)ethane, dpp = 1,3-di(4-pyridyl)propane, pbmb = 1,1′-(1,3-propane)bis-(2-methylbenzimidazole), bmp = 1,5-bis(2-methylbenzimidazol) pentane, pbib = 1,4-bis(imidazol-1-ylmethyl)benzene, beb = 1,4-bis(2-ethylbenzimidazol-1-ylmethyl) benzene), have been gained through hydro(solvo)thermal reactions of 5,5'-(hexane-1,6-diyl)-bis(oxy)diisophthalic acid ligand (H 4 L) with Ni(II) metal ions under the regulation and control of six N-donor ligands. 3-fold interpenetrating complex 1 belongs to a (4,4)-connected 3D bbf net with a vertex symbol of (6 4 ·8 2 )(6 6 ) topology. 3-fold interpenetrating complex 2 presents a (4,4,4)-connected 3D bbf net with a Schäfli symbol of (6 6 ) 2 (6 4 ·8 2 ) topology. 3 features a (3,4)-connected 3,4L13 topology with a Schäfli symbol of (4·6 2 )(4 2 ·6 2 ·8 2 ) topology. 4 possesses a (4,4,4)-connected mog Moganite 3D network fabric and the vertex symbol is (4·6 4 ·8) 2 (4 2 ·6 2 ·8 2 ). 5 takes on a (4,5)-connected architecture and the point symbol is (4·6 9 )(4 2 ·6 6 ·8 2 ). 6 is a (4,7)-connected framework and the Schäfli symbol is (4 5 ·5)(4 7 ·5 3 ·6 11 ). 7 has a (4,4)-connected 4,4L28 topology and the Point (Schäfli) symbol is (4 2 ·6 4 )(4·6 4 ·8). A systematic structural comparison of 1-7 signifies that their frameworks can be regulated through varied conformations of the flexible H 4 L ligand and divers Ndonor ligands. Between the proximal Ni(II) ions, the variable-temperature (2−300 K) magnetic susceptibilities of 6 display overall weak antiferromagnetic coupling. In the complexes-catalyzed homo-coupling reaction of iodobenzene, 3, 5, 6 and 7 have been verified to be effectual catalysts for the synthesis of the biaryl compounds.

Crystal structure of Bis{1-[(benzotriazol-1-yl)methyl]-1-H-1,3-(2-methyl-imidazol)}diiodidocadmium(II), [Cd(C11H11N5)2I2], C22H22N10I2Cd

“…Coordination compounds have attracted interest for potential applications in various areas [4]. The multidentate Nheterocyclic ligands containing rich coordination sites, such as imidazole, triazole, tetrazole are often employed to produce different polymeric networks due to their various coordination modes [4][5][6][7][8]. Recently, our group synthesized 1-[(benzotriazol-1-yl)methyl]-1-H-1,3-(2-methyl-imidazol)(bmi) and studied its coordination behavior [9][10][11][12].…”

Crystal structure of catena-poly[(μ2-3-(1H-pyrazol-4-yl)-5-(pyridin-4-yl)-1,2,4-triazole-κ N:N′)-bis(benzoato-κO)zinc(II)], C24H18N6O4Zn

“…In that regard, the N-donor ligands and aromatic carboxylic acid are perhaps the most promising candidates, because they can interact with a metal surface by both π electrons and the lone-pair electrons at the nitrogen atom and oxygen atom. Hence, they provide access to diverse coordination polymer topologies [9][10][11][12]. In light of the interesting structural diversity in previously reported zinc(II) Metal-Organic frameworks based on triazole-carboxylate [13,14], we set about attempts to prepare transition metal coordination polymers containing the eas- [15].…”

Two Interpenetrated Zn(II) Coordination Polymers: Synthesis, Topological Structures, and Property

“…The values of Eg are estimated as 3.52 and 2.59 eV for CPs 1 and 2 (Figure 4), which were determined by a direct band gap semiconductor: (Ahν) 2 = B(hν − Eg). The values of Eg for CPs 1 and 2 are comparatively a little higher than the series of Ni(II) compounds [37], and the as-synthesized crystalline materials may be optical semiconductors [38].…”