Two New Nonlinear Optical and Ferroelectric Three-Dimensional Metal−Organic Frameworks with an sqp-net

Abstract

Two novel three-dimensional metal-coordination polymers [Cd 2 (L) 4 (μ 2 -X)(X)(H 2 O)] n [X=Cl (1) and Br (2)] have been solvothermally synthesized by the self-assembly of an unsymmetric bridging ligand, [L = 2-(1H-imidazol-1-ylmethyl)-1H-benzoimidazole], and cadmium salts with different anions, respectively. The two complexes are isostructural and exhibit an acentric sqp-net, in which the cadmium ions act as unusual five-connected nodes. The induction of the flexible and unsymmetric ligand leads them to crystallize in a noncentrosymmetric polar packing arrangement, which displays a second harmonic generation response and ferroelectric behaviors.

Pt-Ni@PC900 Hybrid Derived from Layered-Structure Cd-MOF for Fuel Cell ORR Activity

“…The hyperpolarizability value is generally related to the nonlinear optical properties (NLO) for a single molecule or the repeating unit of a coordination polymer. The reported hyperpolarizabilities for second harmonic generation of different cadmium metal–organic frameworks are 0.6 × urea, 0.7 × urea, 1.5 × KDP, 2.3 × KDP, 2 × KDP, and 3 × KDP (KDP, potassium dihydrogen phosphate). Although experimental NLO calculations for any material are very important, but being an option, the NLO potential of the material can be analyzed using theoretical chemistry without applying experimental techniques .…”

Structure–Activity Relationships of 1,2‐Disubstituted Benzimidazoles: Selective Inhibition of Heme Oxygenase‐2 Activity

“…[12] 2-(N-Morpholinyl)methyl-1H-benzimidazole (6):T oas olution of 2-chloromethyl-1H-benzimidazole (2 g) in MeOH (30 mL) was added morpholine (15 mL 2-Cyclopentylmethyl-1H-benzimidazole (11):T his compound was prepared from 1,2-phenylenediamine (2.0 g) and 2-cyclopentylacetic acid (2.5 g) in polyphosphoric acid (30 g), in 65 %y ield, according to ap ublished method. 2-(1H-Imidazol-1-yl)methyl-1H-benzimidazole (1):T his compound was prepared from 1,2-phenylenediamine (2.0 g) and 2-(1H-imidazol-1-yl)acetic acid (2.5 g) in polyphosphoric acid (30 g) (57 %y ield) according to ap ublished method.…”

“…2-(1H-Imidazol-1-yl)methyl-1H-benzimidazole (1):T his compound was prepared from 1,2-phenylenediamine (2.0 g) and 2-(1H-imidazol-1-yl)acetic acid (2.5 g) in polyphosphoric acid (30 g) (57 %y ield) according to ap ublished method. [12] 2-(N-Morpholinyl)methyl-1H-benzimidazole (6) 2-Cyclopentylmethyl-1H-benzimidazole (11):T his compound was prepared from 1,2-phenylenediamine (2.0 g) and 2-cyclopentylacetic acid (2.5 g) in polyphosphoric acid (30 g), in 65 %y ield, according to ap ublished method. [13] 2-Cyclohexylmethyl-1H-benzimidazole (19): [13] Following the procedure for the preparation of 11,1 ,2-phenylenediamine (3.25 g) and 2-cyclohexylacetic acid (4.26 g) were heated in polyphosphoric acid (50 g) at 190 8C.…”

“…The structures of the compounds studied in this work are shown in Tables 1-5 below.T he general approachf or the synthesis of the 1,2-disubstituted benzimidazoles involved the initial synthesis of the 2-substituted1 H-benzimidazoles followed by their conversion into the corresponding 1,2-disubstituted analogues.T he initial 2-substituted compounds were 2-(1Himidazol-1-yl)methyl-1H-benzimidazole (1), 2-(N-morpholinyl)methyl-1H-benzimidazole (6), 2-cyclopentylmethyl-1H-benzimidazole (11), 2-cyclohexylmethyl-1H-benzimidazole (19), and 2-(norborn-2-yl)methyl-1H-benzimidazole (27). Compounds 1, [12] 11, [13] 19, [13] and 27 were each obtained in good yield by acondensation reaction of 1,2-phenylenediamine with the correspondingc arboxylic acid in polyphosphoric acid at elevated temperature (Scheme1). Compound 6 was prepared by the reaction of 2-chloromethyl-1H-benzimidazole and morpholine.…”

Synthesis, Crystal Structure, and Properties of Two 2D Lamella Coordination Polymers Generated from Unsymmetrically Carboxylate Bridging Ligand

“…[9][10][11] Thereinto, unsymmetrical carboxylate bridging ligands, which possess two or more coordination sites with differing donor ability, is expected to lead to a broader palette of coordination polymers. [12][13][14][15] In particular, the different orientations of carboxylic groups situated in unsymmetrical ligands may link metal ions in different directions and distances into extended networks. Subsequently, it is confirmed that unsymmetrical Address correspondence to Guang-Zhen Liu, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, 471022, P. R. China.…”