82137-72-2Relevant articles and documents
New Pyrazole- and Benzimidazole-derived Ligand Systems
Nozari, Mohammad,Addison, Anthony W.,Reeves, GorDan T.,Zeller, Matthias,Jasinski, Jerry P.,Kaur, Manpreet,Gilbert, Jayakumar G.,Hamilton, Clifton R.,Popovitch, Jonathan M.,Wolf, Lawrence M.,Crist, Lindsay E.,Bastida, Natalia
, p. 1291 - 1307 (2018)
A series of N-containing heterocyclic compounds have been synthesized using approaches such as the well-known Knorr synthesis, and a facile N-alkylation method. This series of compounds includes pyrazole derivatives, tris(2-benzimidazolylmethyl)amine derivatives, and “pincer” ligands. Characterization methods include 1H NMR, FT-IR, CHN analyses, UV-vis spectroscopy, and fluorimetry, while X-ray crystal structures are reported for most of the compounds. The crystallographic results affirm a 13C NMR method for isomer assignment of substituted pyrazoles.
Reverse photoluminescence responses of Ln(iii) complexes to methanol vapor clarify the differentiated energy transfer pathway and potential for methanol detection and encryption
Fan, Ya-Nan,Fu, Peng-Yan,Guo, Jing,Pan, Mei,Su, Cheng-Yong,Yin, Shao-Yun
supporting information, p. 16907 - 16914 (2020/12/30)
Advanced photoluminescent (PL) materials with unique and unclonable photophysical behaviors are important for potential applications in hazardous material detection and optical encryption. We herein present new detecting and encrypting models based on the uncommon reverse photoluminescence response of Eu(iii) and Tb(iii) complexes with isomorphic structures. Upon the stimulus of methanol vapor, the characteristic red emission of Eu(iii) shows an unusual turn on magnification depending on crystal morphologies, manifesting a more sensitive response from the lamellar crystals with not so perfect crystalline forms, while the green emission of Tb(iii) turns down conversely. This clarifies an unprecedent proof for the differentiated energy transfer (ET) pathway, i.e., triplet ET to Eu(iii), while singlet ET to Tb(iii) in lanthanide complexes. Furthermore, patterned taggants can be designed from the interweaving of unary and binary Eu/Tb(iii) complexes, presenting new optical detecting and encrypting models with pixel-selective responding and methanol vapor detecting capacities.
Synthesis and characterization of benzimidazole-based zinc complexes as structural carbonic anhydrase models and their applications towards CO 2 hydration
Ibrahim, Mohamed M.,Amin, Mahmoud A.,Ichikawa, Kazuhiko
experimental part, p. 191 - 201 (2011/04/14)
The tripod ligand tris(2-benzimidazolylmethyl)amine L1 and its methylated derivative tris(N-methyl-2-benzimidazolylmethyl)amine L2 were used for the preparation of chloro complexes [L1Zn-Cl](PF 6) 1 and [L2Zn-Cl](PF6) 2. These complexes reacted with AgPF6 in aqueous acetone to form the corresponding aqua complexes [L1Zn-OH2](PF6)2 3, [L2Zn(H2O)](PF6)2 4, which were deprotonated by using KOH to form the hydroxide complexes [L1Zn-OH)] (PF6) 5 and [L2Zn-OH)](PF6) 6. 1H NMR titration of the ligands with Zn(II) ions gave detailed information about the structure of the resulting zinc complexes and the evidence for the existence of the zinc-bound hydroxo species. Complex 3 reacted with CO2 gas in the presence of triethylamine to give the bicarbonate complex [L 1Zn-OCO2H)](PF6), which was characterized by IR and 13C NMR spectroscopes. The X-ray structure of [L 1Zn-NCS]2[Zn(NCS)4] 7 as structural carbonic anhydrase inhibitor was determined and adopted slightly distorted tetrahedral ZnN4 coordination geometries with the equatorial positions occupied by three benzimidazole nitrogen atoms and apical position by nitrogen atom from the thiocyanate anion.
