Crystal structure of monoprotonated cobalt(II) nitrilotriacetate tetrahydrate Co(HNta) · 4H2O

X-ray diffraction analysis of Co(HNta) · 4H2O (I) (H3Nta = N(CH2COOH)3) revealed that its crystals are isostructural to a Zn analog and built from [Co(HNta)(H2O)3] complex molecules and crystallization water. The octahedral coordination of the Co atom includes two O atoms and an N atom provided by the chelating tridentate HNta2- ligand (average Co-O (Nta) 2.055 Å and Co-N 2.205 Å) and three O atoms of water molecules on the shared face (average Co-O(w) 2.105 Å). © 2001 MAIK "Nauka/Interperiodica"

Fields of carbon metasomatism - indicator of ore deposits

Carbonic metasomatites are very interesting subjects in recent years. The carbonic metasomatites were discovered in ore regions of Central Asia and then in Siberia and other regions of Russian Federation. By the present, the carbonic metasomatite have been discovered in ore regions with various hydrothermal mineralization. The carbonic metasomatites are characterized by black color and fine-grained structures. The carbonic metasomatite contains graphite. Graphite is associated with ilmenite, rutile, sulfides of endogenous origin. The carbonic metasomatite contains increased amounts of metals such as V, Ti, Co, Cu, Zn, Pb, Sn, As, W, Au, Re, Ag, Re, Se, and others. Therefore, the somatites are indicators of ore fields

Fields of carbon metasomatism - indicator of ore deposits

Carbonic metasomatites are very interesting subjects in recent years. The carbonic metasomatites were discovered in ore regions of Central Asia and then in Siberia and other regions of Russian Federation. By the present, the carbonic metasomatite have been discovered in ore regions with various hydrothermal mineralization. The carbonic metasomatites are characterized by black color and fine-grained structures. The carbonic metasomatite contains graphite. Graphite is associated with ilmenite, rutile, sulfides of endogenous origin. The carbonic metasomatite contains increased amounts of metals such as V, Ti, Co, Cu, Zn, Pb, Sn, As, W, Au, Re, Ag, Re, Se, and others. Therefore, the somatites are indicators of ore fields

Crystal structure of (2Z)-(3,3-dimethyl-3,4-dihydroisoquinolin- 1(2H)-ylidene)nitrosoacetonitrile

The crystal structure of (2Z)-(3,3-dimethyl-3,4-dihydroisoquinolin-1(2Н)-ylidene)nitrosoacetonitrile is determined (T = 150 K, R1 = 0.0435). The compound crystallizes as the E-cis and Z-cis isomers of the nitroso tautomer. Two independent molecules differ in the rotation of the nitroso group about the bond between the dihydroisoquinoline group and the substituent. Analysis of bond lengths reveals their conjugation and prevailing contribution of the zwitter-ionic structures with the positive charge located on the isoquinoline fragment and the negative charge located on the substituent. Molecules having E and Z conformations are connected by the N–HO hydrogen bond (NO 2.922(3) Å) into dimers. The N–H group of the other molecule forms the intramolecular N–HO hydrogen bond (NO 2.544(3) Å) which closes a sixmembered cycle. Electronic absorption spectra are studied, and quantum-chemical modeling of the compound is performed. © 2017, Pleiades Publishing, Inc

Crystal structure of (2Z)-(3,3-dimethyl-3,4-dihydroisoquinolin- 1(2H)-ylidene)nitrosoacetonitrile

The crystal structure of (2Z)-(3,3-dimethyl-3,4-dihydroisoquinolin-1(2Н)-ylidene)nitrosoacetonitrile is determined (T = 150 K, R1 = 0.0435). The compound crystallizes as the E-cis and Z-cis isomers of the nitroso tautomer. Two independent molecules differ in the rotation of the nitroso group about the bond between the dihydroisoquinoline group and the substituent. Analysis of bond lengths reveals their conjugation and prevailing contribution of the zwitter-ionic structures with the positive charge located on the isoquinoline fragment and the negative charge located on the substituent. Molecules having E and Z conformations are connected by the N–HO hydrogen bond (NO 2.922(3) Å) into dimers. The N–H group of the other molecule forms the intramolecular N–HO hydrogen bond (NO 2.544(3) Å) which closes a sixmembered cycle. Electronic absorption spectra are studied, and quantum-chemical modeling of the compound is performed. © 2017, Pleiades Publishing, Inc

Crystal and molecular structure of 2,2’-(quinoxaline-2,3-diyl)dipyridinium dinitrate (H2 L)(NO3)2

The crystal structure of 2,2’-(quinoxaline-2,3-diyl)dipyridinium dinitrate (Н2L)(NO3)2 is studied by X-ray diffraction (T = 150 K, R1 = 0.0467). The H2L2+ cation is located on the twofold rotation axis and connected with two NO3 − anions by strong N–H···O hydrogen bonds. Planar quinoxaline fragments of cations form stacks with the interplanar spacing of 3.308 Å. The structure of the diprotonated H2L2+ cation is compared with those of the monoprotonated H2L2+ cation and neutral L molecule. © 2016, Pleiades Publishing, Inc

Early Cretaceous alkali basalts and carbonaceous metasomatites in the Far East maritime region

For the first time K-Ar dating data (116-104 mln years) and geochemical composition characteristics are given for albian alkali basic rocks. The similarity of structural position, age, geochemical peculiarities implies the relation between graphite-ilmenite metasomatites and plum alkali basalts. Graphite-ilmenite metasomatites contain high concentrations of some rare and noble metals in the form of nano-admixtures and are regarded as products of plutonic reduced fluids. The revealed polychronic alkali basite belt controls the center of Dalnegorsk mineralization block with the unique in scale Paleogene deposit of skarn-borosilicate ores and accumulation of skarn and vein polymetal fields

Early Cretaceous alkali basalts and carbonaceous metasomatites in the Far East maritime region

For the first time K-Ar dating data (116-104 mln years) and geochemical composition characteristics are given for albian alkali basic rocks. The similarity of structural position, age, geochemical peculiarities implies the relation between graphite-ilmenite metasomatites and plum alkali basalts. Graphite-ilmenite metasomatites contain high concentrations of some rare and noble metals in the form of nano-admixtures and are regarded as products of plutonic reduced fluids. The revealed polychronic alkali basite belt controls the center of Dalnegorsk mineralization block with the unique in scale Paleogene deposit of skarn-borosilicate ores and accumulation of skarn and vein polymetal fields

Crystal and molecular structure of 2,2’-(quinoxaline-2,3-diyl)dipyridinium dinitrate (H2 L)(NO3)2

The crystal structure of 2,2’-(quinoxaline-2,3-diyl)dipyridinium dinitrate (Н2L)(NO3)2 is studied by X-ray diffraction (T = 150 K, R1 = 0.0467). The H2L2+ cation is located on the twofold rotation axis and connected with two NO3 − anions by strong N–H···O hydrogen bonds. Planar quinoxaline fragments of cations form stacks with the interplanar spacing of 3.308 Å. The structure of the diprotonated H2L2+ cation is compared with those of the monoprotonated H2L2+ cation and neutral L molecule. © 2016, Pleiades Publishing, Inc

Synthesis and crystal structure of [Na(H2O)4] [EuL4] · 0.775CH2Cl2 (HL = 1,3-Bis 1,3-dimethyl-1H-pyrazol-4-yl)-1,3-propanedione)

[Na(H2O)4][EuL4] · 0.775CH 2Cl2 (I) has been synthesized by the reaction of Eu(NO 3)3 · 6H2O with 1,3-bis(1,3-dimethyl-1H- pyrasol-4-yl)-1,3-propanedione (HL) in the presence of NaOH. Its crystal struc- ture has been solved by X-ray diffraction analysis. Crystals are tetragonal; a = 16.2401(5) Å, c = 11.9113(4) Å, V=3141.50(17) Å3, ρ calcd = 1.427 g/cm3, μ(MoKα) = 1.140 mm-1, space group P4/n, Z = 2. The structural units forming a crystal of compound I are [EuL4]- complex anions, [Na(H2O) 4]+ cations, and CH2Cl2 mole- cules. The coordination polyhedron of the Eu atom is an Archimedean antiprism formed by the O atoms of four bidentate chelate ligands L-. © Pleiades Publishing, Ltd., 2011