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A neutral complex PN3P-Rh(i)Cl (2) was prepared from a reaction of the PN3P pincer ligand (1) with [Rh(COD)Cl]2 (COD = 1,5-cyclooctadiene). Upon treatment with a suitable base, H–H and Csp2–H activation reactions can be achieved through the deprotonation/reprotonation of one of the N–H arms and dearomatization/rearomatization of the central pyridine ring with the oxidation state of Rh remaining i. [ABSTRACT FROM AUTHOR]

Abstract: In this communication, a novel Er3+ complex Er(PT)3TPPO [PT=1-phenyl-3-methyl-4-tert-butylbenzoyl-5-pyrazolone, TPPO=triphenyl phosphine oxide] is successfully synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. Its optical properties and the energy transfer process from the ligand PT to the Er3+ ion are investigated, the typical near-infrared (NIR) luminescence (centered at around 1530nm) is attributed to the 4I13/2 → 4I15/2 transition of Er3+ ion which results from the efficient energy transfer from PT to Er3+ ion (an antenna effect). The wider full width at half maximum (78nm) peaked at 1530nm in the emission spectrum and the Judd–Ofelt theory calculation on the radiative properties suggest that Er(PT)3TPPO should be a promising candidate for tunable lasers and planar optical amplifiers. [Copyright &y& Elsevier]

Abstract: A novel diimine Cu(I) complex [Cu(ABPQ)(DPEphos)]BF4 [ABPQ and DPEphos are acenaphtho[1,2-b]bipyrido[2,3-h;3,2-f]quinoxaline and bis(2-(diphenylphosphanyl)phenyl) ether, respectively] is synthesized, and its photophysical properties are experimentally and theoretically characterized. The emission bands centered at ca. 400/470 and 550nm of [Cu(ABPQ)(DPEphos)]BF4 are attributed to the ligand-centered π→π* transition and the metal-to-ligand charge transfer dπ(Cu)→π*(N–N) transition, respectively. The luminescence quantum yield of [Cu(ABPQ)(DPEphos)]BF4 in CHCl3 is found to be about five times higher than that of [Cu(Phen)(DPEphos)]BF4. [Copyright &y& Elsevier]