75-15-0Relevant articles and documents
Regularities of the property changes in the compounds EuLnCuS3 (Ln = La-Lu)
Ruseikina, Anna V.,Chernyshev, Vladimir A.,Velikanov, Dmitriy A.,Aleksandrovsky, Aleksandr S.,Shestakov, Nikolay P.,Molokeev, Maxim S.,Grigoriev, Maxim V.,Andreev, Oleg V.,Garmonov, Alexander A.,Matigorov, Alexey V.,Melnikova, Ludmila V.,Kislitsyn, Anatoliy A.,Volkova, Svetlana S.
, (2021/05/04)
This work contains the results of complex experimental research of the compounds EuLnCuS3 (Ln = La-Lu) enhanced by the DFT calculations. It is aimed at the data replenishment with particular attention to the revelation of regularities in the property changes, in order to extend the potential applicability of the materials of the selected chemical class. The ab initio calculations of the fundamental vibrational modes of the crystal structures were in good agreement with experimental results. The wavenumbers and types of the modes were determined, and the degree of the ion participation in the modes was also estimated. The elastic properties of the compounds were calculated. The compounds were found out to be IR-transparent in the range of 4000–400 cm–1. The estimated microhardness of the compounds is in the range of 2.68–3.60 GPa. According to the DSC data, the reversible polymorphous transitions were manifested in the compounds EuLnCuS3 (Ln = Sm, Gd-Lu): for EuSmCuS3 Tα?β = 1437 K, ΔНα?β = 7.0 kJ·mol-1, Tβ?γ = 1453 K, ΔНβ?γ = 2.6 kJ·mol-1; for EuTbCuS3 Tα?β = 1478 K, ΔНα?β = 1.6 kJ·mol-1, Tβ?γ = 1516 K, ΔНβ?γ = 0.9 kJ·mol-1, Tγ?δ = 1548 K, ΔНγ?δ = 1.6 kJ·mol-1; for EuTmCuS3 Tα?β = 1543 K, Tβ?γ = 1593 K, Tγ?δ = 1620 K; for EuYbCuS3 Tα?β = 1513 K, Tβ?γ = 1564 K, Tγ?δ = 1594 K; for EuLuCuS3 Tα?β = 1549 K, Tβ?γ = 1601 K, Tγ?δ = 1628 K. In the EuLnCuS3 series, the transition into either ferro- or ferrimagnetic states occurred in the narrow temperature range from 2 to 5 K. The tetrad effect in the changes of incongruent melting temperature and microhardness conditioned on rLn3+ as well as influencing of phenomenon of crystallochemical contraction were observed. For delimiting between space groups Cmcm and Pnma in the compounds ALnCuS3, the use of the tolerance factor t’ = IR(A)·IR(C) + a×IR(B)2 was verified.
Synthesis of copper(i) cyclic (alkyl)(amino)carbene complexes with potentially bidentate N^N, N^S and S^S ligands for efficient white photoluminescence
Romanov, Alexander S.,Chotard, Florian,Rashid, Jahan,Bochmann, Manfred
, p. 15445 - 15454 (2019/11/03)
The reaction of (Me2L)CuCl with either NaS2CX [X = OEt, NEt2 or carbazolate (Cz)] or with 1,3-diarylguanidine, 1,3-diarylformamidine or thioacetaniline in the presence of KOtBu affords the corresponding S- or N-bound copper complexes (Me2L)Cu(S^S) 1-3, (Me2L)Cu(N^N) 4/5 and (Me2L)Cu(N^S) 6 (aryl = 2,6-diisopropylphenyl; Me2L = 2,6-bis(isopropyl)phenyl-3,3,5,5-tetramethyl-2-pyrrolidinylidene). The crystal structure of (Me2L)Cu(S2CCz) (3) confirmed the three-coordinate geometry with S^S chelation and perpendicular orientation of the carbene and S^S ligands. On heating 3 cleanly eliminates CS2 and forms (Me2L)CuCz. The N-bound complexes show strongly distorted T-shaped (4) or undistorted linear (5) geometries. On excitation with UV light the S-bound complexes proved non-emissive, while the guanidinato and formamidinato complexes are strongly phosphorescent, with excited state lifetimes in the range of 11-24 μs in the solid state. The conformationally flexible formamidinato complex 5 shows intense green-white phosphorescence with a solid-state quantum yield of >96%.
Y2S3 – Y2O3 phase diagram and the enthalpies of phase transitions
Andreev,Pimneva
, p. 24 - 29 (2018/04/17)
A phase diagram of the Y2S3-Y2O3, system has been defined from 1000 K to melts for the first time; the enthalpies of phase transitions in the systems have been determined. The monoclinic phase δ-Y2S3 (P21/m, a = 1.7523(8) nm, b = 0.4010(9) nm, с = 1.0170(7) nm, β = 98.60(6)°; microhardness H = 411 ± 7 HV) transforms at 1716 ± 7 K to the unquenchable high-temperature phase ξ-Y2S3, ΔН = 29 ± 6 J/g (7.9 KJ/mol) as determined by DSC. The quenching can't latch the Y2S3-phase. The melting point of Y2S3 is 1888 ± 7 K; ΔН = 150 ± 28 J/g (41.1 KJ/mol). Y2OS2 has a monoclinic structure (P21/c, а = 0.8256(8) nm, b = 0.6879(8) nm, с = 0.6848(8) nm, β = 99.52(6), Н = 491 ± 13 HV) and melts incongruently at 1790 ± 8 K, ΔН = 190 ± 45 J/g (52 KJ/mol) by the scheme Y2OS2 ? Y2O2S + L (16 mol% Y2O3). Y2O2S has a hexagonal structure (a = 0.3784(5) nm, c= 0.6584(4) nm, Н = 654 ± 7 HV). Its congruent melting temperature is 2350 ± 40 K as determined by visual polythermal analysis (VPTA). The eutectic formed by Y2S3 and Y2OS2 phases has the composition 14.0 ± 0.5 mol% Y2O3 (0.58Y2S3 + 0.42Y2OS2) and melting temperature 1770 ± 6 K; ΔН = 215 ± 39 J/g. Between Y2O2S and Y2O3 phases, there is a eutectic with the coordinates 80 ± 1 mol% Y2O3 (0.6Y2O2S + 0.4Y2O3) and melting temperature 2150 ± 35 K (VPTA).