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Organometallic materials that exhibit white luminescence in condensed phases are of considerable interest for lighting and display applications. Herein, new carbazole-based Au(I) complexes containing an isocyanide group and a long pentyl chain were synthesized. The complex with an unsubstituted carbazole moiety exhibited a white emission at room temperature as well as nematic liquid crystalline behavior. Color tunability from white to blue was achieved when bulkier substituents were introduced at the 3 and 6 positions of the carbazole moiety. Fur-thermore, all complexes possessed long phosphorescence lifetimes in the crystal state. The pro-posed design framework provides new opportunities for practical applications using luminescent organometallic molecules. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

The novel LnIII {Ln = Dy (1_Dy), Gd (2_Gd), and La (3_La)} benzimidazolium tricarboxylate coordination polymers have been synthesized, and their magnetic properties have been investigated. Single-crystal X-ray analysis revealed that 1_Dy, 2_Gd, and 3_La are one-dimensional coordination polymers with general molecular formulas of {[Ln(L)2(H2O)4]center dot(6Br)}infinity [L = 3,3 ',3 ''-((2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene))tris(1-(carboxymethyl)-benzimidazolium)], which crystallized in the monoclinic, P21/c space group. The solid-state packing of these coordination polymers shows the spiral propagation in a one-dimensional direction. The direct current (dc) magnetic data (susceptibility and magnetization) were collected for 1_Dy and 2_Gd. The alternating current (ac) magnetic measurement for 1_Dy at zero field shows the characteristic signature of single-molecule magnets (SMMs) at low temperatures but without clear maxima. Further, to rationalize the experimentally observed magnetic behavior and to understand the factors affecting the dynamic magnetic behavior of 1_Dy, we performed detailed completed active space self-consistent field (CASSCF) based calculations on 1_Dy. Our detailed theoretical analysis suggests that the hydrogen bonding interaction between the coordinated water molecule and the Br- counteranion increases the equatorial electron density, eradicating the slow relaxation in 1_Dy.

Two mild Cu(II) diimine catalyzed click reactions have been reported to be efficient, robust, and additive-free one-pot procedures to isolate carbazole decorated 1,2,3-triazoles with high regioselectivity. The Cu(II) diimine complex [(L)Cu(OAc)2(OH2)], where L = N-(2-pyridinylmethylene)-2,6-dibenzhydryl-4-methoxylamine, was synthesized and characterized. In the first method, the click reactions were demonstrated between 9-(2-propynyl)-carbazole and aryl azide using catalyst 1 at room temperature in water. In the second approach, the fast and convenient procedures to prepare carbazole decorated 1,2,3-triazoles were reported through the mechanical grinding method, which enabled the isolation of carbazole decorated 1,2,3-triazoles within 6:32 min. Besides, both the catalytic protocols were demonstrated without the addition of either external reductant or base. The structural details of carbazole decorated 1,2,3-triazoles were elucidated using single-crystal X-ray diffraction and NMR techniques. Graphical Abstract: Two mild Cu(II) diimine catalyzed click reactions have been reported to be efficient, robust, and additive-free one-pot procedures to isolate carbazole decorated 1,2,3-triazole derivatives with high regioselectivity. [Figure not available: see fulltext.]. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

The imidazole-selone antimony(III) complexes have been described with unique bonding situations around the antimony center. The mononuclear complexes, (L-1)SbCl3 (1) and (L-2)SbCl3 (2) were isolated from the reaction between SbCl3 and corresponding symmetrically crowded, 1,3-bis(2,6-diisopropyl phenyl) imidazole selone (L-1) and unsymmetrically crowded, 2,(2,6-benzhydryl-4-methyl phenyl) imidazole pyridine selone (L-2), respectively. The bonding nature of 1 and 2 differ remarkably due to the unique steric hindrance around the antimony center. Besides, the lone-pair-pi-hole interaction was observed in 1 and 2. The extent of Se -{\textgreater} Sb bonding and (aryl)C -{\textgreater} Sb bonding were further investigated by density functional theory (DFT), including natural bond orbital (NBO), natural population analysis (NPA), and electron density difference (EDD) methods. The theoretical predictions are nearly convincing with a single crystal X-ray analysis. The increasing steric bulk of the imidazole-selone from symmetric to unsymmetrical nature was found to greatly influence the donor-acceptor magnitude of Se -{\textgreater} Sb bonding and (aryl)C -{\textgreater} Sb bonding and lone-pair-pi-hole interactions. The L-2 in 2 acts as a good sigma-donor and pi-donor to Sb(III) compare to L-1 in 1.