D. Yu. Naumov

Spin crossover in iron(II) complexes with tris(pyrazol-1-yl)methane

Mononuclear iron(II) coordination compounds with tris(pyrazol-1-yl)methane (HC(Pz)3) described as [Fe{HC(Pz)3}2]A2 × nH2O, where A = Cl−, Br−, I−, 1/2 SO42−, n = 0–7, were synthesized. The compounds were studied by static magnetic susceptibility measurements, IR and UV/Vis spectroscopy, and powder X-ray diffraction. The crystal and molecular structures of all compounds were determined by single crystal X-ray diffraction.

Framework polymers based on octahedral chalcocyanide cluster [Re6Q8(CN)6]4−/3− anions (Q = Se, Te) and [Nd(Bipy)n]3+ Complexes (n = 1, 2)

AbstractInteraction of salts of the cluster anions {Re [Re6Q8(CN)6]4−/3− (Q = Se, Te) with Nd salts in the presence of 2,2′-bipyridyl (Bipy) ligand brings about new coordination polymers: Pr4nN[{Nd(Bipy)(H2O)4} {Re6Se8(CN)6}] · 2H2O (I) (space group C2/c, a = 18.2918(16) Å, b = 14.9972(13) Å, c = 37.513(3) Å, β = 102.046(4)°, V = 10064.2(15) Å3, Z = 8), [{Nd(Bipy)2(H2O)} {Re6Se8(CN)6}] (II) (space group C2/c, a = 15.8668(3) Å, b = 13.5403(3) Å, c = 20.5189(4) Å, β = 110.135(1)°, V = 4138.89(15) Å3, Z = 4), and [{Nd(Bipy)(EtOH)(H2O)4}{Re6Te8(CN)6}] · EtOH (III) (space group

Structure of dysprosium polysulfide DyS1.83 (Dy6S11) according to x-ray diffraction analysis

P\bar 1

Structure of lead(II) oxalate dihydrate

, a = 9.4733(6) Å, b = 12.5326(8) Å, c = 17.2374(11) Å, α = 96.561(2)°, β = 90.310(2)°, γ = 94.876(2)°, V = 4138.89(15) Å3, Z = 4). The compounds synthesized are characterized by single-crystal X-ray diffraction and IR methods. Compounds I and III have layered (2D) structures, compound II is a framework (3D) polymer.

Structure of [Dy(Phen)(C4H8NCS2)3]·3CH2Cl2 solvate. Magnetic properties and photoluminiscence of [Ln(Phen)(C4H8NCS2)3] (Ln = Sm, Eu, Tb, Dy, Tm) complexes

New complexes of Co(II), Ni(II), and Cu(II) with 1-(4-hydroxyphenyl)-1H-1,2,4-triazole (L) of the composition ML2(H2O)2(NO3)2 · nH2O (M = Co(II), n = 3; M = Ni(II), n = 0; M = Cu(II), n = 0) were synthesized and studied by photoelectron and IR spectroscopy, magnetochemistry, thermogravimetry, and X-ray powder diffraction analysis. The type of μeff(T) relationship suggests that paramagnetic centers in the Co(II) chloride and Cu(II) nitrate and bromide complexes are involved in antiferromagnetic exchange interactions. The exchange energy values were estimated by the molecular field method.

Luminescent zinc(II) and cadmium(II) complexes based on 2-(4,5-dimethyl-1H-imidazol-2-yl)pyridine and 2-(1-hydroxy-4,5-dimethyl-1H-imidazol-2-yl)pyridine

The crystal structure of a single crystal of dysprosium polysulfide DyS1.83 = Dy6S11 is determined. The unit cell parameters are similar to those established for DyS1.76 = Dy4S7, but the composition is different. The unit cell is monoclinic, space group P21/m, a = 11.009(2), b = 11.531(2), c = 11.023(1) Å, β = 91.152(8)∘, V= 1398.1(4) Å3; for Z = 4 this gives the composition Dy6S11, regarding the experimental values of the partial statistic of the S atoms and dcalc = 6.303 g/cm3 (EnrafNonius CAD-4 automatic diffractometer, γMoKα, Raniso = 0.0349 for 6381 unique Ihkl > 2σI of 9804 measured ones). An empirical absorption correction was applied based on transmission curves and habit data. The polysulfide is a PbFCl type structure; the monoclinic unit cell parameters are related to a0 and c0 of the tetragonal cell of PbFCl as [101] ≅ 4a0, [010] ≅3a0, [101] ≅2c0. The crystal is a twin with the ratio of components k2 = 1-k1 = 0.243(2) and a transition matrix 001/010/100. The composition DyS1.83±0.02 agrees with the chemical analysis data and the experimental value dexp = 6.30±0.08 g/cm3. The phase individuality of the polysulfide is confirmed by the form of the P-T projection of the P-T-X diagram of the Dy-S system.

Synthesis and crystal structure of (H3O)2{(Na2(OH)CB[5])2[HV4O12]}Cl · 14H2O

AbstractThe crystal structure of Ag2C2O4 was determined; space group P21/c, a=3.4603(5), b=6.1972(9), c=9.548(2) Å, β=103.47(1)0, V=199.12(6) Å3, Z=2, dcalc=5.066 g/cm3 (Syntex P21 automatic diffractometer, CuKα radiation, ф/2ф scan mode with a rate of 1.98–14.5 deg/min to 2θmax=115°, 548 measured and 274 independent Ihkl, R(F)=0.259). The structure is channel type ionic, with single-layer packing of anions in the (100) plane according to the hexagonal law. In the channels stretched along [100], there are silver dimers with the Ag−Ag distance of 2.945 Å. The C2O42− anion has