33 research outputs found

    2-Hydroxy­imino-N′-[1-(2-pyrid­yl)ethyl­idene]propanohydrazide

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    The title compound, C10H12N4O2, features an intra­molecular N—H⋯N hydrogen bond formed between the imine NH and oxime N atoms. The oxime group and the amide C=O bond are anti to each other. In the crystal, mol­ecules are connected by O—H⋯O hydrogen bonds into supra­molecular zigzag chains along the c axis

    catena-Poly[neodymium(III)-bis­[μ-N-(dimorpholinophosphor­yl)benzene­sulfonamidato]-sodium(I)-bis­[μ-N-(dimorpholinophosphor­yl)benzene­sulfonamidato]]

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    The cubic crystal structure of the title compound, [NaNd(C14H21N3O5PS)4]n, is composed of one-dimensional polymeric chains propagating in [100], built up from [Nd(C14H21N3O5PS)4]− anions and sodium cations functioning as linkers. In the complex anion, the Nd3+ ion has an eightfold coordination environment formed by the sulfonyl and phosphoryl O atoms of four bidentate chelating N-(dimorpholinophosphor­yl)benzene­sulfonamidate ligands: the resulting NdO8 polyhedron can be described as inter­mediate between dodeca­hedral and square anti­prismatic. The sodium ion adopts an NaO4 tetra­hedral geometry arising from four monodentate benzene­sulfonamidate ligands. The resulting crystal structure is unusual because it contains substantial voids (800 Å3 per unit cell), within which there is no evidence of included solvent

    catena-Poly[calcium-bis­[μ-N-(dimethyl­phosphino­yl)benzene­sulfonamidato]]

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    The crystal structure of the title calcium complex, [Ca(C8H11NO5PS)2]n, is composed of a polymeric chain, which is formed due to two bridging sulfonyl groups linking CaII ions in a O—S—O—Ca manner. Thus, the coordination environment of the CaII ions is composed of six O atoms belonging to the phosphoryl and sulfonyl groups of two chelate rings and two additional O atoms of two bridging sulfonyl groups. The coordination polyhedron of the central atom (2 symmetry) has a distorted octa­hedral geometry

    Tetra­methyl N,N′-(2,2,3,3,4,4-hexa­fluoro-1,5-dioxopentane-1,5-di­yl)bis­(phospho­ramidate)

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    The mol­ecule of the title compound, C9H14F6N2O8P2, lies on a twofold rotation axis that passes through the middle C atom of the three-atom fluoro­methyl­ene unit. The carbonyl and phosphoryl groups are in an antiperiplanar conformation. In the crystal, N—H⋯O=P hydrogen bonds link the mol­ecules into polymeric chains parallel to the c axis

    Tetra­methyl­ammonium dimethyl (phenyl­sulfonyl­amido)phosphate(1−)

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    The title compound, C4H12N+·C8H11NO5PS−, was obtained from tetra­methyl­ammonium hydroxide and dimeth­yl(phenyl­sulfon­yl)amido­phosphate. The tetra­methyl­ammonium cation has a slightly distorted tetra­hedral configuration and the N—C bond lengths lie in the range 1.457 (3)–1.492 (3) Å. In the crystal, no classical hydrogen bonds are observed between the cation and the anion

    cis-Diaqua­bis­[dimethyl (phenyl­sulfonyl­imino)­phospho­nato]cobalt(II)

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    In the title diaqua­cobalt complex, [Co(C8H11NO5PS)2(H2O)2], the CoII atom is surrounded by six O atoms belonging to the phosphoryl and sulfonyl groups of two deprotonated chelate ligands and two additional O atoms from water mol­ecules which are in cis positions with respect to one another. The coordination environment of cobalt can be described as a distorted octa­hedron. O—H⋯O hydrogen bonds between the water and sulfonyl O atoms of neighboring mol­ecules form chains running parallel to [010]. Two methoxy groups attached to one phosphorus are disordered over two sets of sites in a 0.6:0.4 ratio

    catena-Poly[sodium-di-μ-aqua-sodium-bis[μ-2,2,2-trichloro-N-(dimorpholinophosphoryl)acetamide]]

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    The title compound, [Na2(C10H16Cl3N3O4P)2(H2O)2]n, can be considered as a two-dimensional coordination polymer in which one-dimensional chains are connected to each other by inter­molecular C—H⋯O hydrogen bonds involving the water mol­ecules. The NaI ion is five-coordinated in a distorted trigonal-bipyramidal geometry. The connection between the two NaI ions is facilitated by the two μ-O atoms of the carbonyl group of the 2,2,2-trichloro-N-(dimorpholino­phosphor­yl)acetamide (CAPh) ligand. A bridging coordination of the CAPh ligand via the carbonyl O atom is observed for the first time. The bridging water mol­ecules form inter­molecular O—H⋯O hydrogen bonds with the O atoms of the morpholine rings and the phosphoryl groups of neighboring CAPh mol­ecules

    REPRODUCTIVE FEATURES OF WEED PLANTS OF FOREST NURSERIES

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    Floristic composition and reproductive and morphological features of weed plants of the forest nurseries are studied. The conducted researches supplement with some knowledge of seed efficiency of the weeds and it allows to improve the system of agro-technical action in the forest nurseries

    Chitosan TECHNOLOGY From Crustacean Shells of the Northern Seas

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    Technological schemes for the production of chitin and chitosan from the crustaceans of the Barents Sea have been developed. We used shells of king crab (Paralithodes camtschaticus) and snow crab (Chionoecetes opilio) as chitin-containing raw materials, which are waste from the processing of crabs and contain 5.5 and 4.9 wt.% chitin, respectively. Technological schemes are developed taking into account the chemical composition of the used raw materials containing a large amount of residual protein (up to 26 wt.% in the king crab shell) and mineral substances (up to 17 wt.% in the snow crab shell). A chemical method for chitin production has been used. The technological scheme includes the stages of the first deproteinization, demineralization, the second deproteinization and depigmentation of the raw materials using chemical reagents - acids, alkalis, etc. The deacetylation reaction in an alkaline medium was used as the main method for chitosan production from chitin. Technological solutions have been found to significantly reduce the consumption of alkali, to form a circuit of alkaline solutions. This leads to the reduction of pollution of wastewater generated during the production of chitin and chitosan. The resulting polysaccharide chitosan has a degree of deacetylation of 80–85%. Such a product is considered as a valuable ingredient for high-quality functional foods
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