Tailoring photoluminescence stability in double perovskite red phosphors A2BAlF6:Mn4+(A = Rb, Cs; B = K, Rb)vianeighboring-cation modulation

We have effectively driven the photoluminescence stability in water tolerance and anti-thermal quenching behavior in double perovskite fluorides A2BAlF6:Mn4+(A = Rb, Cs; B = K, Rb)viamodulating the neighboring cation on the A-site or B-site.

Synthesis and Structural Characterization of a Monofunctionalized Phloroglucin-Derivative: A Precursor for Heterotrinuclear meta-Phenylene Bridged Complexes

As part of our synthetic efforts for new triplesalen derivatives, we reacted 2,4,6-triacetyl- 1,3,5-trihydroxybenzene (1) with excess Cu(ClO4)2 · 6H2O, imidazole, and ethylenediamine. However, not the triple ketimine derivative was formed but the mononuclear CuII complex [LCuII(ImH)]ClO4 · 0.5EtOH · 0.5H2O (HL = 6-(1-(2-aminoethylimino)ethyl)-2,4-diacetyl-1,3,5-trihydroxybenzene) with only one ketimine function. This complex forms a one-dimensional coordination polymer in the solid state through the apical binding of a keto-oxygen atom of one cation to the CuII ion of a neighboring cation. Magnetic measurements reveal the presence of weak antiferromagnetic intra-chain interactions

Structure of the charge-transfer salt 2,2',5,5'-tetraselenafulvalene–7,7,8,8-tetracyano-p-quinodimethane (TSeF–TCNQ)

2,2′,5,5′-Tetraselenafulvalene-7,7,8,8-tetracyano-p-quinodimethane (1/1), TSeF–TCNQ, C6H4Se4.C12H4N4, Mr = 596.13, monoclinic, P21/c, a = 12.5048 (4), b = 3.8724 (2), c = 18.5041 (7) Å, β = 104.131 (3)°, V = 868.9 Å3, T = 297 K, Z = 2, F(000) = 560, Dx = 2.28 Mg m−3, λ(Cu Kα) = 1.5418 Å, μ = 115.7 cm−1, R(F) = 0.018, wR(F) = 0.030 for 1393 unique reflections with σ(F 2) > 3F 2. The crystals are isostructural with the corresponding tetrathiafulvalene salt, TTF–TCNQ, with both cations and anions arranged in segregated stacks parallel to b. There are Se...N distances of 3.17 and 3.18 Å, along a, between cation and anion stacks, and H...H distances of 2.58 Å, along c, between neighboring cation stacks, all shorter than the corresponding distances in TTF–TCNQ.