Cobalt complexes of Co(3Cn) 2 (MeOH) 4 , derived from 3,4,5-trialkyloxybenzoate ligand (noted as 3Cn) with n = 10, 12, 14 and 16, were synthesized and characterized. The crystal of Co(1C 12 ) 2 (MeOH) 4 were determined by means of x-ray single crystal analysis. It crystallizes in the monoclinic P21/c space group with a = 24.3271(19) Å, b = 14.0058(11) Å, c = 6.4612(4) Å, a = g = 90 o , b = 94.368(4) o , and Z = 2. The phase texture and mesogenic properties were detected by polarized optical microscopic and powder x-ray diffraction technique. It was found that these compounds display the cubic phases. Differential scanning calorimetric data indicated that these compounds were nearly room temperature liquid crystalline and with a very wide mesogenic phase range.
A new ruthenium complex, [Ru(L)(bpy)2]ṁ2PF6, (L = 3,5‐di(2ṁ‐pyridyl)‐1,2,4‐oxadiazole), was synthesized and characterized. The assignment of chemical shift for [Ru(L)(bpy)2]ṁ2PF6 was accomplished by HHCOSY technique. The cyclic voltammogram of [Ru(L)(bpy)2]ṁ2PF6 shows a metal‐centered RuII/RuII oxidation with potential at 1.35 V, as well as four reversible reduction waves with the former two potentials at −1.24 and −1.60 V, attributed to two bpy/bpy− process, and the latter two potentials at −1.86 and −2.16 V, attributed to L/L− and L−/L2−, respectively. The absorption spectrum of the ruthenium complex was dominated by metal‐to‐ligand charge transfer (MLCT) band in the visible range, with absorption maxima appearing at 442 nm and molar extinction coefficient of 13 × 103 M−1cm−1. The phosphorescent emission band has been attributed to from MLCT triplet state.
One cuprous complex [Cu(L)(PPh3)I] was obtained by reaction of [Cu(PPh3)3I] (PPh3 = triphenyl‐phosphine) with a new α‐diimine ligand L (N‐diphenylmethylene‐3,5‐di(2 ‐pyridyl)‐4‐amino‐1,2,4‐triazole). The complex has been characterized by UV‐Vis, luminescence, 1H NMR spectroscopy and cyclic voltammetric study. The structure of ligand L and complex are confirmed by single crystal X‐ray diffraction study. The compound [Cu(L)(PPh3)I] crystallizes in the monoclinic P21/c space group with a = 19.9291(4), b = 10.0691(2), c = 21.9245(5), α = γ = 90, β = 92.481(10), and Z = 4. The complex shows a MLCT band in the 350˜545 nm region and exhibits luminescent emission at 600 nm at room temperature in dichloromethane solution. Cyclic voltammogram of [Cu(L)(PPh3)I] shows a quasi‐reversible redox couple of the copper center at 0.67 V for Cu(I)/Cu(II) and an irreversible reduction potential at −0.98 V accompanied by a stripping peak of copper at‐0.11 V for Cu(I)/Cu(0).
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