7789-42-6Relevant articles and documents
New organically templated thiocyanatocadmates and chlorocuprate(ii): synthesis and structural characterization
Guo, Bing,Zhang, Xiao,Yu, Jie-Hui,Xu, Ji-Qing
, p. 11470 - 11481 (2015)
With various organic base molecules as the countercations, five new thiocyanatocadmates [H2(tmen)][Cd(SCN)4] (tmen = N,N,N′,N′-tetramethylethylenediamine) 1, [H2(tmba)][Cd2(SCN)6] (tmba = N,N,N′,N′-te
A thermochemical study of adducts of 2-pyrrolidone with zinc(III), cadmium(II) and mercury(II) halides
Vieira, Eunice F. S.,Queiroz, Jose C. de,Dias, Francisco S.
, p. 249 - 260 (1995)
The standard molar enthalpies of acid-base reactions in the condensed state (Δ(r)H(0)) of the adducts MX2 . nBuL (where M is Zn, Cd, Hg; Xis Cl, Br, I; n = 1, 2, 3; BuL is 2-pyrrolidone) were determined from e nthalpies of dissolution (Δ(i)H(0)) of metal halide ligands and adducts, at 298.15 K, obtained by calorimetric methods in solution. Using the values of Δ(r)H(0) and auxiliary data from the literature the standard enthalpies of formation (Δ(f)H(0)), decomposition (Δ(d)H(0)) and lattice enthalpy (Δ(latt)H(0)) of these adducts weredetermined. The enthalpy of vaporization of BuL, Δ(vap)H(0)(BuL), was found to be 41.71+/-0.56 kJ mol**-1 and, from this value, the entha lpies of reaction in the gaseous state (Δ(g)H(0)) were estimated. The values of Δ(g)H(0) were used in calculations of the mean dissociation enthalpy of the metal-oxygen bond, D(M-O), of the obtained adducts, and are correlated with energetic parameters of the metal halides.
Thermal decomposition of complexes of cadmium(II) and mercury(II) with triphenylphosphanes
Verma,Verma,Bhushan,Verma
, p. 725 - 729 (2008/10/09)
A series of substituted triphenylphosphane complexes of the type CdL 2X2 (L= triorthotolylphosphane or trimetatolylphosphane; X=Cl-, Br- or I-) and HgL2X 2 (L=triphenylphosphane or triorthotolylphosphane) was prepared fresh. The thermal decomposition was carried out in air with heating rate programmed at 10°C min-1 and it revealed that the complexes with ortho derivative were less stable and the triphenylphosphane moiety leaves along with halogen in the first step. All the complexes were stable up to 210°C. However, the stability order of the tetrahedral complexes was X=Cl>Br. Values of n, E, lnA and ΔS # have been approximated and compared. Complexes having Br have higher E a, lnA and ΔS # values than that having Cl.
Investigation on the thermal decomposition some heterodinuclear Ni II-MII complexes prepared from ONNO type reduced Schiff base compounds (M II=ZnII, CdII)
Aksu,Durmus,Sari,Emreguel,Svoboda,Fuess,Atakol
, p. 541 - 547 (2008/10/09)
N,N'-bis(salicylidene)-1,3-propanediamine (LH2), N,N'-bis(salicylidene)-2,2'-dimethyl-1,3-propanediamine (LDMH2), N,N'-bis(salicylidene)-2-hydroxy-1,3-propanediamine (LOH3), N,N'-bis(2-hydroxyacetophenylidene)-1,3-propanediamine (LACH2) and N,N'-bis(2-hydroxyacetophenone)-2,2'-dimethyl-1,3-propanediamine (LACDMH 2) were synthesized and reduced to their phenol-amine form in alcoholic media using NaBH4 (LHH2, LDM HH2, LOHHH2, LACHH 2 and LACDMHH2). Heterodinuclear complexes were synthesized using Ni(II), Zn(II) and Cd(II) salts, according to the template method in DMF media. The complex structures were analyzed using elemental analysis, IR spectroscopy, and thermogravimetry. Suitable crystals of only one complex were obtained and its structure determined using X-ray diffraction, NiLACH?CdBr2?DMF2, space group orthorhombic, Pbca, a=20.249, b=14.881, c=20.565 A and Z=8. The heterodinuclear complexes were seen to be of [Ni?ligand?MX 2?DMF2] structure (ligand=LH2-, LDM H2-, LOHH2-, LACH2-, LACDMH2-, M=ZnII, CdII, X=Br-, I-). Thermogravimetric analysis showed irreversible bond breakage of the coordinatively bonded DMF molecules followed by decomposition at this temperature.
Synthesis, characterization and calorimetric study of zinc group halide adducts with aniline
da Silva Jr., Umberto G.,de Oliveira, ótom A.,de Farias, Robson F.
, p. 2 - 4 (2008/10/09)
The adducts ZnCl2·2an, ZnBr2·1.5an, CdCl2·2an, CdBr2·2an, CdI2·2an, HgCl2·2an and HgBr2·2an (where an = aniline) were synthesized and characterized by elemental analysis, infrare
Cadmium(II) complexes of 1,2-di(imino-4′-antipyrinyl)ethane
Deepa,Madhu,Radhakrishnan
, p. 883 - 888 (2008/10/09)
Cadmium(II) complexes of the Schiff base 1,2-di(imino-4′-antipyrinyl) ethane (GA) having general formulae [Cd(GA)]X2; (X = NO 3-, ClO4-) and [Cd(GA)X 2]; (X = Cl- Br- or I-) have been synthesized and characterized by elemental analysis, electrical conductance in non-aqueous solvents, infrared and electronic spectra as well as thermogravimetric analysis. In all these complexes, GA acts as a neutral tetradentate ligand coordinating through both the carbonyl oxygens and both the azomethine nitrogens. Both the anions are coordinated in the halide complexes while these remain as counter ions in the perchlorate and nitrate complexes. Thermal decomposition behavior of the nitrate complex indicates that it is stable up to 234°C and undergoes a three-stage decomposition pattern yielding the anhydrous Cadmium(II) oxide as the final residue. Copyright
Thermal decomposition kinetics of some aniline complexes of zinc group metals
Sikha,Indrasenan
, p. 1393 - 1402 (2007/10/03)
The kinetics and mechanism of thermal decomposition of aniline complexes of zinc group metals have been studied using non-isothermal thermogravimetry. Kinetic parameters have been calculated for each of the decomposition stages using the Coats-Redfern equation. The mechanisms of the reactions have also been found out, and the rate controlling processes are found to be either random nucleation with the formation of one nucleus on each particle (Mampel equation) or phase boundary reaction with cylindrical symmetry or spherical symmetry.
Thermodynamic Properties of PbBr2-CdBr2 and PbBr 2-CdBr2-KBr Melts
Burylev,Moisov,Kritskaya,Kostenko
, p. 2076 - 2078 (2007/10/03)
The temperature dependence of the saturation vapor pressure in the PbBr2-CdBr2 and PbBr2-CdBr2-KBr systems was studied using the boiling-point method. The obtained results were used to calculate the vapor composition and the thermodynamic characteristics for the systems under study.
Thermal studies and vibrational analyses of m-methylaniline complexes of Zn(II), Cd(II) and Hg(II) bromides
Golcuk,Altun,Kumru
, p. 1841 - 1847 (2007/10/03)
The complexes having the MBr2L2 (M: Zn, Cd and Hg; L: m-methylaniline) formulae have been prepared and characterized by their elemental analyses, thermogravimetric analyses, IR and Raman spectral studies. IR and Raman bands of the complexes have been assigned as compared with the free ligand. Coordination effects on the internal modes of m-methylaniline have been discussed. Vibrational spectra propose that the [ZnBr2(mMA)2] complex is in a tetrahedral environment around Zn(II) ion with C2v symmetry whereas Cd(II) and Hg(II) complexes have 5-coordinate polymeric bromide bridged structures.
Cd5P2Br4: First Cadmium Analogue of the Millon's Base Salts
Shatruk,Reshetova,Shevel'kov,Popovkin
, p. 495 - 499 (2008/10/08)
A new cadmium pnictide halide - Cd5P2Br4 - was synthesized, and its structure was determined (R = 0.0525). The compound crystallizes in the orthorhombic symmetry system, space group Pna21 (a = 12.189 ?, b = 7.7080 ?, c = 13.664 ?, Z = 4). A characteristic feature of the Cd5P2Br4 structure is a distorted tridymite-type framework composed of cadmium and phosphorus atoms. The framework cavities accommodate discrete tetrahedral groups CdBr4. Such a structure makes it possible to classify the new compound as the first cadmium-phosphorus analogue of Millon's base salts. The structure of Cd5P2Br4 is compared to the structure of Hg5P2Br4, another phosphorus-containing analogue of Millon's base salts.