Tetramminenickel hydrogen hexamolybdometalates(III)

Tetramminenickel hydrogen hexamolybdoaluminate and hexamolybdogallate(III) of compositions [Ni(NH₃)₄] · H[AlMo₆O₁₈(OH)₆] · 10H₂O (I) and [Ni(NH₃)₄] · H[GaMo₆O₁₈(OH)₆] · 10H₂O (II) were synthesized and characterized by mass spectrometry, thermogravimetry, X-ray powder diffraction, and IR spectroscopy. Their crystals are triclinic. For compound I, a= 17.30 Å, b= 14.69 Å, c= 10.45 Å, α = 129.07, β = 65.91°, γ = 138.01°, V = 1338.7l ų, ρ_calcd = 2.75g/cm³, Z = 2; for compound II, a = 17.38 Å, b= 14.75 Å, c= 10.51 Å, α = 131.38°, β= 65.96°, γ = 138.09, V = 1338.15 ų, ρ_calcd = 2.68 g/cm³, Z = 2.     

Synthesis and study of tetraamminecobalt hydrogen hexamolybdochromate

Tetraamminecobalt hydrogen hexamolybdochromate [Co(NH₃)₄] · H[CrMo₆O₁₈(OH)₆] · 6H₂O (I) was synthesized and studied by mass spectrometry, thermogravimetry, IR spectroscopy, and X-ray diffraction. Crystals of I are monoclinic; a = 16.27 Å, b = 5.61 Å, c = 12.36 Å, β = 119.89°, V = 1100.12 ų, ρ_calcd = 2.29 g/cm³, and Z = 1.     

Synthesis and study of hexaamminecadmium hydrogen hexamolybdocobaltate(III) and hexamolybdochromate(III)

Hexaamminecadmium hydrogen hexamolybdocobaltate(III) and hydrogen hexamolybdochromate(III) of compositions [Cd(NH₃)₆] · H[CoMo₆O₁₈(OH)₆] · 6H₂O (I) and [Cd(NH₃)₆] · H[CrMo₆O₁₈(OH)₆] · 6H₂O (II), respectively, were synthesized and studied by mass spectroscopy, thermo-gravimetry, X-ray powder diffraction, and IR spectroscopy. Crystals of I and II are monoclinic. For I: a = 10.79 Å, b = 3.70 Å, c = 11.95 Å, β = 91.05°, V = 470.12 ų, ρ_calc = 2.37 g/cm³, Z = 2; and for II: a = 10.80 Å, b = 3.68 Å, c = 11.97 Å, β = 91.07°, V = 468.98 ų, ρ_calc = 2.36 g/cm³, Z = 2.     

Synthesis and characterization of amminecopper hexamolybdometalates

Representatives of a new class of heteropoly compounds (HPCs) have been synthesized. Such an HPC is an oligomer, which is built of two monomeric 6-heteropolyanions with the Perloff structure; these monomers are linked through an amminecopper cation. The composition of the new HPCs is Cu(NH₃)₄ · ?ub;H[MMo₆O₁₈(OH)₆] · 10H₂O?ub;₂Cu(NH₃)₄, where M = Al(III), Cr(III), Fe(III), Co(III), Ga(III), or Rh(III). The compounds have been characterized using IR spectroscopy, thermogravimetry, and X-ray powder diffraction.     

Synthesis and physicochemical study of tetraaquatritetraphthalatodiiron(III)

An iron(III) complex of terephthalic acid of the general formula Fe₂[C₆H₄(COO)₂]₃(H₂O)₄.was synthesized. The composition and structure of the complex were studied by X-ray phase analysis and IR spectroscopy. The thermal stability of the complex was studied in the range 20–900°C. It was shown that doping with a Fe₂[C₆H₄(COO)₂]₃(H₂O)₄ reagent improves the rheological properties of heavy oil.     

Synthesis and study of ammonium hexamolybdobismuthate(III)

Ammonium hexamolybdobismuthate(III) of composition (NH₄)₃[BiMo₆O₁₈(OH)₆] · 7H₂O (I) was synthesized and studied by mass spectrometry, X-ray diffraction, IR spectroscopy, and thermogravimetry. The compound is monoclinic: a = 10.438 Å, b = 7.909 Å, c = 18.127 Å, β = 96.59°, V = 1486.76 ų, ρ_calc = 3.32 g/cm³, Z = 2.     

Synthesis and physicochemical study of hexamminechromium(III) hexamolybdocobaltate

Hexamminechromium(III) hexamolybdocobaltate [Cr(NH₃)₆][CoMo₆O₁₈(OH)₆] · 5H₂O was prepared and studied by mass spectrometry, IR spectroscopy, thermogravimetry, and powder X-ray diffraction. The crystals are monoclinic: a = 11.70 Å, b = 10.69 Å, c = 15.34 Å, β = 115.04°, V = 1905.11 ų, ρ_calcd. = 1.06 g/cm³, Z = 1.     

Synthesis and physicochemical study of hexaamminechromium(III) hexamolybdogallate

Hexaamminechromium(III) hexamolybdogallate of composition [Cr(NH₃)₆][GaMo₆O₁₈(OH)₆] · 5H₂O (I) was synthesized and studied by mass spectrometry, IR spectroscopy, thermogravimetry, and X-ray diffraction. Crystals I are monoclinic: a = 11.77 Å, b = 10.97 Å, c = 15.49 Å, β = 115.11°, V = 1811.29 ų, ρ_calc = 1.17 g/cm³, Z = 1. The compound obtained was used as a catalyst for soft oxidation of natural gas at 633 K.     

Preparation and study of hydrogen hexamolybdometallates(III) with the hexamminecadmium cation

Hydrogen hexamolybdogallate and hexamolybdoaluminate with the hexamminecadmium cation [Cd(NH₃)₆] · H[GaMo₆O₁₈(OH)₆] · 6H₂O (I) and [Cd(NH₃)₆] · H[AlMo₆O₁₈(OH)₆] · 6H₂O (II) were synthesized and studied by mass spectrometry, thermogravimetric analysis, powder X-ray diffraction, and IR spectroscopy. The crystals are monoclinic; I: a = 10.82 Å, b = 3.69 Å, c = 11.99 Å, β = 91.06°, V= 469.72 ų, ρ_calcd = 2.34 g/cm³, Z = 2; II: a = 10.81 Å, b = 3.67 Å, c =11.98 Å, β = 91.08°, V = 469.78 ų, ρ_calcd = 2.38 g/cm³, Z = 2.     

Loss of water and hydrogen cyanide from aquopentamminecobalt(III) hexacyanoferrate(III)

Previous studies on the non-isothermal decomposition of [Co(NH₃)₅H₂O] [Fe(CN)₆] showed that H₂O and three molecules of HCN are lost simultaneously but the results of the isothermal studies reported here show that these processes can be partially separated. It was found that the first reaction involves the loss of H₂O and two molecules of HCN and the second reaction results in the loss of an additional molecule of HCN. Kinetic studies have been performed and kinetic parameters are reported here and possible mechanisms are discussed.     

Kinetic study of hydrogen peroxide reaction with hydroxonitrilotri(methylenephosphonato)iron(III) complex

The decomposition of hydrogen peroxide in the presence of hydroxonitrilotri(methylenephosphonato)iron(III), [Fe(NTMP)(OH)^4–], was studied in nitrate media (=0.10–0.26 M) over the 0.2–0.5 mM concentration range for the iron complex and the temperature range 26–40°C. The rate law;

Synthesis and Study of Aluminum Hexamolybdenocobaltate(III) and Hexamolybdenochromate(III)

Aluminum hexamolybdenocobaltate and hexamolybdenochromate of the Al[MMo₆O₁₈(OH)₆] · 16H₂O composition, where M = Co(III) or Cr(III), were synthesized for the first time. X-ray diffraction study shows that the crystals of the compounds are triclinic; space group P1, Z = 1, and _calcd = 2.665 and 2.611 g/cm³, respectively. The compounds were studied by IR spectroscopy and thermogravimetry.     

Synthesis of cationic gold(III) complexes using iodine(III)

Abstract

We report the synthesis and characterization of cationic Au(III) complexes supported by nitrogen-based ligands. The syntheses are achieved by reacting Au(I) complexes [Au(N-Me-imidazole)₂]⁺ and [Au(pyridine)(NHC)]⁺ with iodine(III) reagents PhI(OTf)(OAc) and [PhI(pyridine)₂]²⁺ yielding a series of cationic gold(III) complexes. In contrast, reactions of phosphine ligated gold(I) complexes with iodine(III) reagents results in the oxidation of the phosphine ligand.     

Synthesis and characterization of Pr(III), Nd(III) and Er(III) complexes with 2,6-pyridinedimethanol

The reactions of Ln(NO₃)₃?6H₂O (Ln=Pr, Nd or Er) with the potentially tridentate O,N,O chelating ligand 2,6-pyridinedimethanol (H₂pydm) in a 1:2 M ratio were investigated, and complexes with the formula [Ln(H₂pydm)₂(NO₃)₂](NO₃) (Ln=Pr or Nd) (1 and 2) and [Er(H₂pydm)₃](NO₃)₃ (3) were isolated. The compounds contain 10-coordinate Pr(III) and Nd(III) ions that crystallize in the triclinic space group P-1 while the 9-coordinate Er(III) complex crystallizes in the monoclinic system (P2₁/n). A new lanthanide complex, [Pr(H₂pydm)₃](Cl)₃?DMF (4), has been synthesized by reaction of PrCl₃?6H₂O and H₂pydm. The nine-coordinate Pr(III) is bound to three H₂pydm ligands. X-ray crystal structures of 1–4 reveal that the ligand coordinates tridentate via the pyridyl nitrogen and the two hydroxyl oxygens. The electronic absorption spectra of 1–4 show 4f–4f transitions.     

Complex rhodium(III) salts with isonicotinic acid: Synthesis and study

A method for the synthesis of complex rhodium(III) salts of the trans-dichlorotetramine series with isonicotinic acid (iso-NicH) was developed. Three new compounds were isolated: [Rh(iso-NicH)₃(iso-Nic)Cl₂] (I), [Rh(iso-NicH)₄Cl₂]Cl · 4H₂O (II), and Na3[Rh(iso-Nic)₄Cl₂] · 9H₂O (III). The compounds synthesized were characterized by elemental analysis, X-ray phase analysis, and IR spectroscopy. The crystal structures of salts II and III were determined by X-ray diffraction analysis. The thermal properties of all compounds were studied by the DTA method. The intermediate and final thermolysis products were isolated and characterized.     

Synthesis of nanosized iron(III) oxide and study of its formation features

Nanosized iron(III) oxide has been obtained by thermolysis of iron(III) acetylacetonate using diphenyl ether as a dispersion medium. It has been shown that increase in thermolysis temperature from 180 to 250°C allows one to half the average size of Fe₂O₃ nanoparticles. The introduction of surfactant into dispersion medium also leads to decrease of the average size of particles down to 4 nm. The phase composition of the prepared nano-Fe₂O₃ has been established, the possibility to reduce nano-Fe₂O₃ into iron metal has been shown by temperature-programmed reduction