A Series of Single, Double, and Triple Me₂biim-Bridged Dinuclear, Trinuclear, and Polymeric Complexes:  Syntheses, Crystal Structures, and Luminescent Properties

Abstract

Reaction of ZnCl(2) and Me(2)biim (Me(2)biim = N,N'-dimethyl-2,2-'-biimidazole) in acidic or neutral aqueous solutions gave the noncoordinated ZnCl(4).H(2)Me(2)biim (1) or the double Me(2)biim bridged [Zn(2)Cl(4)(mu-Me(2)biim)(2)] (2). Use of CdX(2) (X = Cl, Br, I) instead of ZnCl(2) yielded the single Me(2)biim bridged one-dimensional coordination polymer [CdX(2)(mu-Me(2)biim)](n) (X = Cl, 3; Br, 4; I, 5). The stacking of the infinite chains are dominated by C-H...X interactions in 3 and 4 but by I...I interactions in 5, responsible for their different crystal structures. Use of Zn(NO(3))(2) instead of ZnCl(2) produced the novel triple Me(2)biim-bridged [Zn(2)(mu-Me(2)biim)(3)(H(2)O)(2)](NO(3))(4).H(2)O (6). The unprecedented hexa-Me(2)bim bridged trinuclear [Cd(3)(mu-Me(2)biim)(8)](2)(ClO(4))(12)(H(2)O)(6) (7) was obtained by using Cd(CH(3)CO(2))(2) in the presence of NaClO(4). Compounds 1-7 were characterized by X-ray crystallography and IR. Examination of photophysical properties of 1-7 indicates that the fluorescence emission of Me(2)biim has been effectively enhanced, quenched, or shifted in its metal complexes 1-7.

Tuning Cadmium Coordination Architectures by Phenylenediacetate Position Isomers and 1,4‐Bis(benzimidazol‐1‐ylmethyl)benzene

“…[45][46][47][48] In this paper, the solid state luminescent properties of complexes 1-3 were investigated in the solid state at room temperature. As depicted in Figure 5, complexes 1-3 exhibit intense blue fluorescent emission bands at 386, 380 and 384 nm upon excitation at ca.…”

Synthesis, crystal structure and nuclease activity of a new Mn(II) complex involving 2-(2-1H-imidazolyl)-1H-imdazolium ligand

“…The presence of an imidazole moiety in biological molecules has encouraged the studies of H 2 biim-containing transition metal complexes [24,25]. However, a few studies about the interaction between the transition metal complexes of 2,2′-biimidazole (Biim) and DNA have been reported, and most of the studies are limited in the structure characterization [26,27].…”

“…The presence of an imidazole moiety in biological molecules has encouraged the studies of H 2 biim-containing transition metal complexes [24,25]. However, a few studies about the interaction between the transition metal complexes of 2,2′-biimidazole (Biim) and DNA have been reported, and most of the studies are limited in the structure characterization [26,27].By these reasons, we aimed to discover a new DNA cleavage reagent containing Biim ligand. In this paper, a new Mn(II) complex of Mn(H 3 biim) 2 (NCS) 2 Cl 2 (H 3 biim_2-(2-1H-imidazolyl)-1H-imidazolium) was synthesized and characterized by elemental analyses and X-ray single crystal diffraction.…”

Two novel supramolecular isomers based on 2,2′-biimidazole derivative and zinc ions: Syntheses, structures and luminescent properties

“…2,2 0 -Biimidazole (H 2 biim) is an evergreen ligand that has attracted constant interest in supramolecular chemistry [10], biochemistry [11], cluster science [12], and antitumor drugs [13]. Some complexes based on H 2 biim or its derivatives have been reported because of their wide-ranging applications in enzymatic reactions and their intriguing structures [14,15].…”