Construction of two Cd(II) complexes by flexible adipic acid plus 2-((benzoimidazol-yl)methyl)-1H-tetrazole ligand

A one-dimensional zinc(II) coordination polymer with a three-dimensional supramolecular architecture incorporating 1-[(1H-benzimidazol-2-yl)methyl]-1H-tetrazole and adipate

“…Free bimt displays fluorescence with an emission maximum at 304 nm upon excitation at 269 nm, which corresponds to that reported in the literature and can probably be attributed to the -* transition of bimt (Duan et al, 2015). H 2 adi is nearly nonfluorescent from 300 to 500 nm at ambient temperature; similar cases have been reported (Chen et al, 2010;Duan et al, 2015). Obviously, the emission bands observed in polymer (I) are neither MLCT (metal-toligand charge transfer) nor LMCT (ligand-to-metal charge transfer), since the Zn II ions are difficult to oxidize or reduce due to the d 10 configuration (Bai et al, 2011; Ge et al, 2015; .…”

“…To better understand the nature of the emission bands, we analyzed the fluorescence properties of the corresponding free ligands under the same experimental conditions. Free bimt displays fluorescence with an emission maximum at 304 nm upon excitation at 269 nm, which corresponds to that reported in the literature and can probably be attributed to the -* transition of bimt (Duan et al, 2015). H 2 adi is nearly nonfluorescent from 300 to 500 nm at ambient temperature; similar cases have been reported (Chen et al, 2010;Duan et al, 2015).…”

“…However, it is still a challenge to predict the exact structures and compositions of the final products. In the construction of coordination polymers, many factors can influence the formation of the final architectures, such as the nature of the metal centres, organic ligands, counter-anions, and so on (Maity & Biradha, 2016;Roy et al, 2016;Duan et al, 2015). For example, through the self-assembly of 5-nitrobenzene-1,3-dicarboxylate and 4,4 0 -azobispyridine with Zn(NO 3 ) 2 , Cd-(NO 3 ) 2 , MnCl 2 and Co(NO 3 ) 2 , five coordination polymers with completely different architectures of diverse dimensionality and topology and different functionality can be obtained .…”

“…Arici and co-workers have synthesized seven Zn II coordination polymers through the reactions of azobenzene-3,3 0 ,5,5 0 -tetracarboxylic acid with Zn II salts in the presence of different ancillary ligands and have investigated the effect of substituent groups on the bis(imidazole) ligands on the structural diversity (Arici et al, 2016). In previous work, one Zn-bimt-glu and three Cd-bimt-adi coordination polymers have been synthesized by the reaction of 1-[(1Hbenzimidazol-2-yl)methyl]-1H-tetrazole (bimt) and glutaric acid (H 2 glu) with Zn(Ac) 2 (Huang, Zhang & Meng, 2015) and by the reactions of bimt and adipic acid (H 2 adi) with Cd(Ac) 2 , CdCl 2 and CdBr 2 (Duan et al, 2015;Zhang, Hao & Yang, 2015). In this paper, we have used bimt, H 2 adi and Zn(Ac) 2 (or ZnCl 2 or ZnBr 2 ) as reactants in an attempt to prepare new Zn-bimt-adi coordination polymers and determine the effects of metal ion, counter-anion and ancillary ligand on the structures of coordination polymers.…”

A new one-dimensional CuIIcomplex with a three-dimensional supramolecular architecture incorporating benzene-1,3-dicarboxylate and 1-[(1H-benzotriazol-1-yl)methyl]-1H-imidazole

“…Up to now, numerous complexes have been synthesized and characterized, but it is still a challenge to predict the exact structures and compositions of the final products. Several factors, such as organic ligands, metal ions, temperature, counter-anions, pH values and solvents, have been found to play roles in the construction of complexes (Maity et al, 2016;Roy et al, 2016;Duan et al, 2015). Generally, a judicious choice of organic ligands is one of the most important parameters in the rational design and synthesis of such materials.…”