A novel efficient method for the selective synthesis of 2-substituted benzimidazoles is described through condensation reaction of o-phenylenediamines with a wide rang of aliphatic, aromatic and heteroaromatic aldehyde substrates using Brönsted acidic ionic liquid as a reusable catalyst under metal-free conditions at ambient temperature. Notably, Dodecylimidazolium hydrogen sulfate ([DodecIm][HSO4])
behaviours: longer alkyl chains were shown to produce more marked mechanochromism. A reproducible and reversible two-colour emission writing/erasing process was achieved by employing the iridium(III) materials as a medium. Powder X-ray diffractometry and differential scanning calorimetric studies suggest that the reversible transformation between crystalline and amorphous states upon application of external
Simultaneous modification of N-alkyl chains on cyclometalated and ancillary ligands of cationic iridium(<scp>iii</scp>) complexes towards efficient piezochromic luminescence properties
In this study, we have designed and synthesized a series of multifunctional cationic iridium(III) complexes with different lengths of N-alkyl chains on 2-phenyl-1H-benzimidazole-based cyclometalatedligands and phenyl-pyridine type ancillary ligands. The photophysical properties of each complex have been investigated in detail and also ascertained by comprehensive density functional theory calculations
在这项研究中,我们设计和合成了一系列多功能的阳离子铱(III)配合物,这些配合物在2-苯基-1 H-苯并咪唑基环金属化配体和苯基吡啶类辅助配体上具有不同长度的N-烷基链。已经详细研究了每种复合物的光物理性质,并通过综合密度泛函理论计算确定了这些复合物的光物理性质。尽管对它们的发射光谱和溶液中的激发态特性影响很小,但改变了氮-烷基链长可以在固态下有效地改变其光物理性质。所有复合物均表现出迷人的可见光致变色发光(PCL)行为。最有趣的是,这些具有较长N-烷基链的铱(III)基发光体通过机械研磨和溶剂发烟显示出显着的发射颜色变化和独特的可逆特征。粉末X射线衍射(PXRD),1 H NMR和MALDI-TOF / TOF质谱数据表明,结晶态和非晶态之间的相变对于当前的压致变色至关重要。此外,由于在聚集态中具有高量子效率的优点,所研究的铱(III)配合物可作为一种有效的传感器,用于敏感和选择性地检测爆炸性的2
Synthesis of 1,2-disubstituted benzimidazoles through DDQ-oxidized intramolecular dehydrogenative coupling of N,N′-dialkyl o-phenylenediamines
which starts from N,N′-dialkyl o-phenylenediamines via intramolecular dehydrogenative coupling under the oxidation of DDQ with mild conditions. Through detailed optimization of reaction conditions, only DDQ was found essential without any additives to reach to the highest yield of 99%. In the cases of linear aliphatic substituents, the synthesis of 1-alkyl-2-phenylbenzimidazoles showed high selectivities