13446-03-2Relevant articles and documents
Gram-scale and solvent-free synthesis of Mn-doped lead halide perovskite nanocrystals
Liu, Qian,Liu, Kaikai,Liang, Yachuan,Sun, Junlu,Dong, Lin,Shan, Chong-Xin
, (2020)
Although Mn-doped lead halide perovskites could alleviate the environmental burden of Pb, their synthesis process suffers from intricate operations, high operating temperature, low production, or toxic strong polar solvents. Developing a simple and green route for Mn-doped halide perovskites with mass production is highly desirable for perovskite-derived applications. In this work, we developed a facile and environmental-benign synthesis strategy for large-scale preparation of Mn-doped lead halide perovskite nanocrystals. The nanocrystals were prepared via a mechano-synthesis process without organic solvents. We investigated the influence of atomic composition on their morphology, crystal structure and optical performance. Our results show that the perovskite nanocrystals have dual-emissions from the 4T1 to 6A1 transition of Mn2+ and the excitonic recombination of perovskite hosts, respectively. The achieved Mn:CsPbX3 nanocrystals show well-tailored color rendering when used as LED phosphors. This work presents a scalable and facile strategy for Mn-doped perovskite production without organic solvents, which promises low-cost and eco-friendly LEDs.
Thermal analysis of some complexes with malonamide
De Beukeleer, S. H. J.,Desseyn, H. O.,Perlepes, S. P.,Mullens, J.
, p. 149 - 162 (1995)
In alkaline medium, malonamide forms anionic planar complexes [ML2](2-) . xH2O where M is Ni or Cu. Thermograms and vibrational spectra clearly indicate that three different nickel anion complexes could be isolated, with x being respectively 2, 1 and 0. O
Synthesis and Reactivity Towards Dioxygen of Some Manganese(II) Complexes of Tertiary Amines. Crystal Structures of >, 2> and
Lane, Helen P.,Godfrey, Stephen M.,Pritchard, Robin G.,McAuliffe, Charles A.
, p. 701 - 706 (1995)
Some manganese(II)-tertiary amine complexes of stoichiometry MnX2(NR3) have been prepared for the first time.Magnetic susceptibility and X-ray crystallographic studies on (R=Et or n-Pr) indicate that the complexes have a dimeric structure, in contrast to the analogous tertiary phosphine complexes which are polymeric.The crystal structure of which contains a mononuclear manganese site has also been determined.This complex is postulated to arise from reaction of a solution of with trace quantities of moisture.The reaction of the complexes with dioxygen has also been examined: shows no interaction, absorbs 2 mol of dioxygen per mol of complex, whereas absorbs anly 1.In contrast to the analogous tertiary phosphine complexes, the complexes do not exhibit reversible binding of dioxygen.
Microwave-assisted carbohydrohalogenation of first-row transition-metal oxides (M = V, Cr, Mn, Fe, Co, Ni, Cu) with the formation of element halides
Berger, Matthias,Neumeyer, Felix,Auner, Norbert
, p. 11691 - 11693 (2013)
The anhydrous forms of first-row transition-metal chlorides and bromides ranging from vanadium to copper were synthesized in a one-step reaction using the relatively inexpensive element oxides, carbon sources, and halogen halides as starting materials. The reactions were carried out in a microwave oven to give quantitative yields within short reaction times.
Novel High-Temperature Polymorphs of MgBr2 and MnBr2 - Limits of Powder Diffraction for Structure Determination
Schneider, Michael,Kuske, Peter,Lutz, Heinz Dieter
, p. 761 - 763 (1992)
High-temperature polymorphs of magnesium bromide and manganese bromide, hexagonal, Rm, Z=3.MgBr2, Mr=184.13, Cu Kα1, λ=1.54051 Angstroem, T=973 K, a=3.9152(7), c=19.420(4) Angstroem, V=257.80(9) Angstroem3.MnBr2, Mr =214.76, neutron radiation, λ=1.594(2) Angstroem, T=773 K, a=3.92240(2), c=19.167(2) Angstroem, V=255.38(3) Angstroem3, Rietveld refinement, 10 2θ 150 deg, Rwp=0.13.The hitherto unknown high-temperature polymorphs of both MgBr2 and MnBr2 crystallize in the CdCl2 form.The manganese compound is pseudocubic =11.0864(1) Angstroem at 773 K> above 623 K.Distinction between the rhombohedral layered CdCl2 structure and the cubic three-dimensional net λ-MnO2 structure is not possible by powder diffraction experiments alone.Additional observations must be employed.The JCPDS File Nos. for MnBr2 and MgBr2 are 43-1499 and 43-1500 respectively.
Thermal analysis of manganese (II) complexes of general formula (Et 4N)2[MnBrnCl4?n]
Styczeń,Gazda,Wyrzykowski
, p. 21 - 27 (2010)
Thermal decomposition of compounds consisting of tetrahalogenomanganates(II) anions, [MnBrnCl4?n] 2? (n = 0-4), and a tetraethylammonium cation has been studied using the DSC and TG techniques. The measurements were carried out in an argon atmosphere over the temperature ranges 173-500K (DSC) and 300-1073K (TG). Products of the thermal decomposition were identified by MS, FTIR, Far-FTIR spectroscopy as well as X-ray powder diffractometry.
Phase Engineering of Cesium Manganese Bromides Nanocrystals with Color-Tunable Emission
Chen, Junsheng,Han, Keli,Kong, Qingkun,Liu, Qingtong,Liu, Siping,Wang, Yiying,Yang, Bin,Zhang, Hongling,Zhang, Ruiling,Zheng, Daoyuan
, p. 19653 - 19659 (2021)
For display applications, it is highly desirable to obtain tunable red/green/blue emission. However, lead-free perovskite nanocrystals (NCs) generally exhibit broadband emission with poor color purity. Herein, we developed a unique phase transition strategy to engineer the emission color of lead-free cesium manganese bromides NCs and we can achieve a tunable red/green/blue emission with high color purity in these NCs. Such phase transition can be triggered by isopropanol: from one dimensional (1D) CsMnBr3 NCs (red-color emission) to zero dimensional (0D) Cs3MnBr5 NCs (green-color emission). Furthermore, in a humid environment both 1D CsMnBr3 NCs and 0D Cs3MnBr5 NCs can be transformed into 0D Cs2MnBr4?2 H2O NCs (blue-color emission). Cs2MnBr4?2 H2O NCs could inversely transform into the mixture of CsMnBr3 and Cs3MnBr5 phase during the thermal annealing dehydration step. Our work highlights the tunable optical properties in single component NCs via phase engineering and provides a new avenue for future endeavors in light-emitting devices.
Synthesis and thermal studies of 2,4′-bipyridyl complexes of manganese(II) salts
Czakis-Sulikowska,Kaluzna
, p. 51 - 60 (2008/10/09)
2,4′Bipyridyl (2,4′bipy or L) complexes of Mn(II) with the formulae MnL2X2·2H2O (X-=Cl, Br, NCS, NO3), MnLSO4·5H2O and MnL4(ClO4)2·2H2O were synthesized and characterized via the IR spectra and magnetic, and conductivity measurements. The nature of the Mn(II)-ligand coordination is discussed. The thermal decompositions of these compounds were studied in air atmosphere. The mode of decomposition depends on the anion present, but the final product in all cases is Mn3O4. Some of the intermediates (MnL2Cl2, MnLCl2, MnL2Br2, MnL2(NCS)2 and MnLSO4) formed during the pyrolysis are isomeric with 2,2′-bipy and 4,4′-bipy complexes.
Synthesis of some 3d-Metal Complexes of 2,6-Diacetylpyridine(benzyl and acetone)hydrazone
Singh,Ansari,Rana
, p. 448 - 451 (2007/10/03)
2,6-Diacetylpyridine bis(benzyl and acetone)hydrazone and some 3d-metal complexes have been prepared. These complexes are five-coordinated trigonal bipyramidal. The ligand coordinates through the pyridine-N and amide-N. Formation of two chelate rings by one molecule of ligand, is a feature that undoubtedly enhances the stability of the complexes.
Synthesis and characterization of coordinately unsaturated phosphine complexes of divalent V, Cr, Mn, Fe, and Co. Crystal structures of [CrCl2(dippe)]2 and feCl2(dippe)
Hermes, Ann R.,Girolami, Gregory S.
, p. 1775 - 1781 (2008/10/08)
The reaction of divalent transition-metal halides with the bulky chelating phosphine 1,2-bis(diisopropylphosphino)ethane, dippe, gives a series of coordinately unsaturated complexes of stoichiometry MX2(dippe) for M = V, Cr, Mn, Fe, or Co. Both the vanadium(II) and chromium(II) complexes readily form adducts with tetrahydrofuran or acetonitrile. The base-free chromium species exists as a dimer in the solid state, [CrCl2(dippe)]2, that consists of two square-planar chromium centers arranged in pairs via asymmetric chloride bridges. Averaged distances for the two independent molecules are as follows: Cr?Cr = 3.605 (2) ?; Cr-P = 2.481 (2), 2.511 (2) ?; Cr-Cl(t) = 2.333 (2) ?; Cr-Cl(b) = 2.380 (2), 2.606 (2) ?. Crystal data for Cr2Cl4P4C28H64: space group P1, a = 13.225 (2) ?, b = 14.834 (3) ?, c = 11.101 (2) ?, α = 97.35 (1)°, β = 114.21 (1)°, γ = 84.26 (1)°, V = 1967.3 (6) ?3, Z = 2, RF = 4.2%, RwF = 4.7% on 3435 reflections and 344 variables. The manganese, iron, and cobalt complexes are all tetrahedral monomers, as confirmed by the X-ray crystal structure of FeCl2(dippe): Fe-P = 2.46 (1) ?, Fe-Cl = 2.21 (1) ?, P-Fe-P = 83.8 (3)°, Cl-Fe-Cl = 117.1 (4)°. Crystal data for FeCl2P2C14H32: space group Pbca, a = 24.66 (1) ?, b = 22.67 (1) ?, c = 14.995 (6) ?, V 8385 (8) ?3, Z = 16, RF = 12.0%, RwF = 12.6% on 1547 reflections and 201 variables. NMR and EPR studies show that all of the four-coordinate species exist in high-spin electronic configurations. The MX2(dippe) complexes provide an excellent opportunity to examine the behavior of coordinately unsaturated first-row transition-metal species and serve as excellent starting materials for the preparation of low-electron-count organometallic derivatives of these elements.
