20601-83-6Relevant articles and documents
2-(N,N-Dimethylamino)ethylselenolates of cadmium(II): Syntheses, structure of [Cd3(OAc)2(SeCH2CH2NMe2 )4] and their use as single source precursors for the preparation of CdSe nanoparticles
Kedarnath,Dey, Sandip,Jain, Vimal K.,Dey, Gautam K.,Varghese, Babu
, p. 2383 - 2391 (2006)
The reaction of Cd(OAc)2 · 2H2O with NaSeCH2CH2NMe2 gave a homoleptic cadmium selenolate, [Cd(SeCH2CH2NMe2)2]. The latter complex, on treatment with Cd(OAc)2 · 2H2O, afforded [Cd3(OAc)2(SeCH2CH2NMe2 )4], which was structurally characterized by single-crystal X-ray diffraction analysis. Pyrolysis of [Cd(SeCH2CH2NMe2)2] either in a mixture of hot hexadecylamine (HDA) and tri-n-octylphosphine oxide (TOPO) or in a furnace (180 and 200 °C) gave CdSe nanoparticles with average sizes varying between 3 and 21 nm. Both cubic and hexagonal phases of CdSe nanoparticles have been isolated under different experimental conditions. The CdSe nanoparticles were characterized by UV-Vis, photoluminescence, X-ray diffraction and electron microscopy. Time resolved luminescence measurements showed three different decay times for both band edge and trap state emissions.
Molecular clusters of binary and ternary mercury chalcogenides: Colloidal synthesis, characterization, and optical spectra
Kuno, Masaru,Higginson, Keith A.,Qadri, Syed B.,Yousuf, Mohammad,Lee, Sang Ho,Davis, Benjamin L.,Mattoussi, Hedi
, p. 5758 - 5767 (2003)
A series of binary (HgSe) and ternary (HgSe1-xSx) mercury chalcogenide clusters are synthesized utilizing a colloidal technique involving the phase separation of metal and chalcogen precursors in the presence of strong Hg(II) coordinating ligands. The clusters vary in size between 2 and 3 nm and possess the cubic zinc blende structure of the bulk. Energy-dispersive X-ray measurements show that the composition of the ternary material can be varied throughout the entire composition range from HgS to HgSe. In all cases, the linear absorption of these binary and ternary species is narrow with well-resolved transitions at both the band edge and at higher energies. Complementary band edge emission is also observed with no apparent deep trap emission. Size- and composition (x)-dependent optical properties of these clusters are investigated using photoluminescence (PL) and photoluminescence excitation (PLE) spectra. In the case of HgSe clusters, the size-dependent behavior of up to four excited states is followed. For HgSe1-xSx clusters, where x varies from 0 to 1, a size/composition-dependent progression of up to five excited states is observed.
Optimization studies of HgSe thin film deposition by electrochemical atomic layer epitaxy (EC-ALE)
Venkatasamy, Venkatram,Mathe, Mkhulu K.,Cox, Stephen M.,Happek, Uwe,Stickney, John L.
, p. 4347 - 4351 (2006)
Studies of the optimization of HgSe thin film deposition using electrochemical atomic layer epitaxy (EC-ALE) are reported. Cyclic voltammetry was used to obtain approximate deposition potentials for each element. These potentials were then coupled with their respective solutions to deposit atomic layers of the elements, in a cycle. The cycle, used with an automated flow deposition system, was then repeated to form thin films, the number of cycles performed determining the thickness of the deposit. In the formation of HgSe, the effect of Hg and Se deposition potentials, and a Se stripping potential, were adjusted to optimize the deposition program. Electron probe microanalysis (EPMA) of 100 cycle deposits, grown using the optimized program, showed a Se/Hg ratio of 1.08. Ellipsometric measurements of the deposit indicated a thickness of 19 nm, where 35 nm was expected. X-ray diffraction displayed a pattern consistent with the formation of a zinc blende structure, with a strong (1 1 1) preferred orientation. Glancing angle fourier transform infrared spectroscopy (FTIR) absorption measurements of the deposit suggested a negative gap of 0.60 eV.
Gobrecht, H.,Gerhardt, U.,Peinemann, B.,Tausend, A.
, p. 2246 - 2250 (1961)
Thallium mercury chalcobromides, TlHg6Q4Br 5 (Q = S, Se)
Wibowo, Arief C.,Malliakas, Christos D.,Chung, Duck Young,Im, Jino,Freeman, Arthur J.,Kanatzidis, Mercouri G.
, p. 11875 - 11880 (2013)
The new compounds TlHg6Q4Br5 (Q = S, Se) are reported along with their syntheses, crystal structures, and thermal and optical properties, as well as electronic band structure calculations. Both compounds crystallize in the tetragonal I4/m space group with a = 14.145(1) ?, c = 8.803(1) ?, and dcalc = 7.299 g/cm3 for TlHg6S4Br5 (compound 1) and a = 14.518(2) ?, c = 8.782(1) ?, and dcalc = 7.619 g/cm3 for TlHg6Se4Br5 (compound 2). They consist of cuboid Hg12Q8 building units interconnected by trigonal pyramids of BrHg3, forming a three-dimensional structure. The interstitial spaces are filled with thallium and bromide ions. Compounds 1 and 2 melt incongruently and show band gaps of 3.03 and 2.80 eV, respectively, which agree well with the calculated ones. First-principles electronic structure calculations at the density functional theory level reveal that both compounds have indirect band gaps, but there also exist direct transitions at energies similar to the indirect gaps.
Bis(l-methyIimidazolyl)diselenide and l-methylimidazole-2-selenolate complexes of zinc, cadmium, and mercury: Synthesis, characterization, and their conversion to metal selenide quantum dots
Kedarnath, Gotluru,Kumbhare, Liladhar Baburao,Jain, Vimal Kumar,Wadawale, Amey,Dey, Gautam Kumar,Thinaharan, Chidamabaranathan,Naveen, Shivalingegowda,Sridhar, Mandayam Anandalwar,Prasad, Javaregowda Shashidhara
, p. 489 - 494 (2008)
Treatment of a methanolic solution of metal acetate with bis(l-methylimidazolyl)diselenide, [(MelmSe)2], yields complexes of composition [M(OAc)2{(MeImSe)2}] (M = Zn, Cd, or Hg) whereas reactions of [MX2(M2NCH2CH 2-NMe2)] (X = CI or OAc) with sodium 1 -methylimidazole-2-selenolate gave selenolate complexes of the general formula [M(MeImSe)2] (M = Zn or Cd). The complexes were characterized by elemental analysis, IR, UV-vis, NMR (1H, 13C, and 77Se) data. The crystal structure of [Cd(OAc)2{(MeImSe)2}] was established by single-crystal X-ray diffraction. The cadmium atom adopts a distorted octahedral configuration defined by asymmetrically chelated acetate groups and chelating diselenide ligand. Thermal behavior of adducts was studied by thermogravimetric analysis. Pyrolysis in hexadecylamine/tri-n-octylphosphine oxide gave MSe quantum dots, which were characterized by UV-vis, photolumi-nescence, XRD, EDAX, SAED, and TEM.
SURFACE DERIVATIZATION AND ISOLATION OF SEMICONDUCTOR CLUSTER MOLECULES.
Steigerwald,Alivisatos,Gibson,Harris,Kortan,Muller,Thayer,Duncan,Douglass,Brus
, p. 3046 - 3050 (1988)
The authors describe a synthesis of nanometer-sized clusters of CdSe using organometallic reagents in inverse micellar solution and chemical modification of the surface of these cluster compounds. In particular we show how the clusters grow in the presence of added reagents and how the surface may be terminated and passivated by the addition of organoselenides. Passivation of the surface allows for the removal of the cluster molecules from the reaction medium and the isolation of organometallic molecules which are zinc blende CdSe clusters terminated by covalently attached organic ligands. Preliminary cluster characterization via resonance Raman, infrared, and NMR spectroscopy, X-ray diffraction, transmission electron microscopy, and size-exclusion chromatography is reported.
Incorporation of A2Q into HgQ and dimensional reduction to A2Hg3Q4 and A2Hg6Q7 (A = K, Rb, Cs; Q = S, Se). Access of Li ions in A2Hg6Q7 through topotactic ion-exchange
Axtell III, Enos A.,Park, Younbong,Chondroudis, Konstantinos,Kanatzidis, Mercouri G.
, p. 124 - 136 (1998)
The synthesis of the one-dimensional K2Hg3Q4 (Q = S, Se) and Cs2Hg3Se4 and the three-dimensional A2Hg6S7 (A = K, Rb, Cs), and A2Hg6Se7 (A = Rb, Cs) in reactive A2Q(x) fluxes is reported. Pale yellow, hexagonal plates of K2Hg3S4 crystallize in space group Pbcn, with a = 10.561(5) ?, b = 6.534(3) ?, and c = 13.706(2) ?, V = 945.8(7) ?,3 d(calc) = 5.68 g/cm3, and final R = 5.7%, R(w) = 6.3%. Red, hexagonal plates of K2Hg3Se4 crystallize in space group Pbcn, with a = 10.820(2) ?, b = 6.783(1) ?, and c 14.042(2) ?, v = 1030.6(5) ?,3 d(calc) = 6.42 g/cm3, and final R = 7.7%, R(w) = 8.4%. Orange yellow, hexagonal plates of Cs2Hg3Se4 crystallize in space group Pbcn, with a = 12.047(4) ?, b = 6.465(2) ?, and c = 14.771(6) ?, V = 1150.4(7) ?, 3 d(calc) = 6.83 g/cm3, and final R = 5.5%, R(w) = 6.2%. Black needles of K2Hg6S7 crystallize in space group P421m, with a = 13.805(8) ? and c = 4.080(3) ?, V = 778(1) ?, 3 d(calc) = 6.43 g/cm3, and final R = 3.1%, R(w) 3.6%. Black needles of Rb2Hg6S7 crystallize in space group P42nm, with a = 13.9221(8) ? and c = 4.1204(2) ?, V = 798.6(1) ?, 3 d(calc) = 6.65 g/cm3, and final R = 4.3%, R(w) = 5.0%. Black needles of Cs2Hg6S7 crystallize in space group P42nm, with a = 13.958(4) ? and c = 4.159(2) ?, V = 810.2(8) ?, 3 d(calc) = 6.94 g/cm3, and final R = 4.3%, R(w) = 4.4%. Black needles of Cs2Hg6Se7 crystallize in space group P42nm, with a = 14.505(7) ? and c = 4.308(2) ?, V = 906(1) ?, 3 d(calc) = 7.41 g/cm3, and final R = 3.6%, R(w) = 4.0%. The A2Hg3Q4 compounds Contain linear chains. The A2Hg6Q7 compounds display noncentrosymmetric frameworks with A+ cations residing in tunnels formed by both tetrahedral and linear Hg atoms. K2Hg6S7, Rb2Hg6S7, Cs2Hg6S7, Rb2Hg6Se7, and Cs2Hg6Se7 display room-temperature bandgaps of 1.51, 1.55, 1.61, 1.13, and 1.17 eV, respectively. Bandgap engineering through S/Se solid solutions of the type Rb2Hg6Se(7-x)S(x) and Cs2Hg6Se(7-x)S(x) is possible in-these materials. All A2Hg6Q7 melt congruently, with melting points of 556 ± 10 °C, except for Rb2Hg6Se7 which degrades. Rb2Hg6S7 can undergo ion exchange reactions with LiI to give Li1.8Rb0.2Hg6S7.
Blue, M. D.,Kruse, P. W.
, p. 577 - 578 (1962)
Mercury bismuth chalcohalides, Hg3Q2Bi 2Cl8 (Q = S, Se, Te): Syntheses, crystal structures, band structures, and optical properties
Wibowo, Arief C.,Malliakas, Christos D.,Chung, Duck Young,Im, Jino,Freeman, Arthur J.,Kanatzidis, Mercouri G.
, p. 2973 - 2979 (2013)
Three quaternary mercury bismuth chalcohalides, Hg3Q 2Bi2Cl8 (Q = S, Se, Te), are reported along with their syntheses, crystal structures, electronic band structures, and optical properties. The compounds are structurally similar with a layer comprised of a hole perforated sheet network of [Hg3Q 2]2+ (Q = S and Te) that forms by fused cyclohexane, chairlike Hg6Q6 rings. The cationic charge in the network is balanced by edge-sharing monocapped trigonal-prismatic anions of [Bi 2Cl8]2- that form a two-dimensional network located between layers. Compound 1, Hg3S2Bi 2Cl8, crystallizes in the monoclinic space group C12/m1 with a = 12.9381(9) A, b = 7.3828(6) A, c = 9.2606(6) A, and β = 116.641(5). Compound 2, Hg3Te2Bi 2Cl8, crystallizes in the monoclinic space group C12/c1 with a = 17.483(4) A, b = 7.684(2) A, c = 13.415(3) A, and β = 104.72(3). The crystals of the Hg3Se2Bi 2Cl8 analogue exhibit complex modulations and structural disorder, which complicated its structural refinement. Compounds 1 and 2 melt incongruently and show band gaps of 3.26 and 2.80 eV, respectively, which are in a good agreement with those from band-structure density functional theory calculations.
Benzing, W. C.,Conn, J. B.,Magee, J. V.,Sheehan, E. J.
, p. 2657 - 2659 (1958)
Henisch, H. K.,Saker, E. W.
, p. 149 - 154 (1952)
Synthesis, characterization, and photoluminescence properties of HgSe nanoparticles using a novel mercury precursor by the sonochemical method
Esmaeili-Zare, Mahdiyeh,Salavati-Niasari, Masoud
, p. 8185 - 8198 (2015)
In this paper, we report the synthesis and characterization of novel mercury selenide (HgSe) nanoparticles by sonochemical method. The HgSe nanoparticles have been prepared using [N,N′-bis(salicylaldehydo)ethylenediamine] mercury(II), [Hg(salen)] complex, as a novel precursor. The effects of the different capping agents, such as sodium dodecyl-benzene-sulfonate, polyethylene glycol, and polyvinyl pyrrolidone on the particle size and morphology of the samples have been investigated. The effect of different parameters, such as: temperature, power of irradiation, and reducing agent were also examined. These nanoparticles were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, photoluminescence, X-ray energy dispersive spectroscopy, and Fourier transform infrared spectroscopy.
Deposition of amorphous mercury selenide thin films by aqueous reactive solution growth technique
Pramanik,Bhattacharya
, p. 945 - 952 (1989)
A chemical method has been developed for the preparation of mercury selenide (HgSe) thin films on a glass substrate at room temperature. Mercury selenide thin films were prepared by using mercury formamide, a novel complex compound, and sodium selenosulphate as a selenide releasing agent. The adherence and uniformity of the film were improved by adding polyvinyl pyrrolidone as a minor additive. X-ray diffraction, optical absorption and electrical measurements were performed to characterize the deposition of mercury selenide. The films were found to be amorphous, p-type semiconductors with an energy gap of 1.42eV.
Synthesis and characterization of fused imidazole heterocyclic selenoesters and their application for chemical detoxification of HgCl2
Sharma, Nidhi,Kumar, Sanjeev,Kumar, Sangit,Mehta,Bhasin
, p. 2702 - 2710 (2018/02/19)
A new series of selenoester derivatives of imidazo[1,2-a]pyridine and imidazo[1,2-a]pyrimidine was synthesized under mild conditions using a simple methodology by the reaction of in situ generated sodium selenocarboxylates with 2-(chloromethyl)imidazo[1,2
