Synthesis, Structures and Magnetic Properties of Cu^II and Co^II Compounds Based on Asymmetric 5‐(1H‐Imidazole‐1‐yl)‐3‐pyridine Carboxylic Acid

Abstract

Five coordination compounds [Cu 2 (impc) 2 (μ 2-OH)Cl] n (1), [Cu 2 (impc) 2 (μ 2-OH)Br] n (2), [Co(impc) 2 (H 2 O) 2 ] n (3), [Co 4 (impc) 4 (SO 4) 2 (H 2 O)] n (4) and {[Co(impc)(H 2 O) 2 ]•H 2 O} (5) based on asymmetric 5-(1H-imidazole-1-yl)-3-pyridinecarboxylic acid (Himpc) have been hydrothermally synthesized and structurally characterized. 1 and 2 are isostructural and consist of binuclear Cu II units and display two-dimensional (2D) framework, where 1 and 2 present a new {(4.6 2)(4 2 .6 5 .8 2 .10)(4)} topology. 3 features a 1D chain structure. Polymer 4, which also displays a new Schläfli symbol {(4 13 .6 20 .8 8 .10 4)(4 3) 2 (4)}, contains tetranuclear Co II cluster and is a 2D structure. The planar-type tetranuclear Co II cluster with SO 4 2bridge in 4 has not been [a] Prof. J.

Colorimetric Fluorescence of a 2,4,5‐Triaryl Imidazole‐Based Sensor for the Selective Detection of Iron

“…[27][28][29][30][31][32] Attachment of a strong suction or donor group to an imidazole ring causes intramolecular charge transfer (ICT). [33][34][35] Therefore, most of the compounds based on the structure of imidazole have superior luminescence properties. In addition, the bipolar structure of this push-pull electron gives imidazole derivatives more easily regulated photophysical and chemical properties.…”

“…Imidazole is a planar five‐membered electron‐deficient aromatic compound containing two nitrogen atoms with completely different charge properties, one of which is electron‐rich and the other electron‐deficient [27–32] . Attachment of a strong suction or donor group to an imidazole ring causes intramolecular charge transfer (ICT) [33–35] . Therefore, most of the compounds based on the structure of imidazole have superior luminescence properties.…”