نتایج جستجو برای: cyanates
تعداد نتایج: 554 فیلتر نتایج به سال:
In the title complex, [Ni(NCS)2(C6H6N2O)2(H2O)2], the Ni(II) ion is located on an inversion center and is coordinated in a distorted octa-hedral environment by two N atoms from two nicotinamide ligands and two water mol-ecules in the equatorial plane, and two N atoms from two thio-cyanate anions in the axial positions, all acting as monodentate ligands. In the crystal, weak N-H⋯S hydrogen bonds...
Urea inglucose solutions has been advanced as a chemotherapeutic agent in sickle cell disease because it has been found effective both in reversing and in blocking sickling. It has been suggested recently that this beneficial action of urea may be the result of formation of cyanate from urea and subsequent carbamylation of beta S globin chains in the hemoglobin S molecule. In this paper, we sho...
In the title complex, [Ni(NCS)(2)(C(7)H(9)NO)(2)], the Ni(II) atom is in a distorted octa-hedral coordination environment defined by two N atoms of the two thio-cyanate ions and by the N and O atoms of the two chelating 2-(pyridin-2-yl)ethanol ligands. The complex mol-ecule is located around a crystallographic inversion center. In the crystal, mol-ecules are connected into a two-dimensional pol...
The structure of the complex salt, cis-[Cr(NCS)2(cyclam)]2[Cr2O7]·H2O (cyclam = 1,4,8,11-tetra-aza-cyclo-tetra-decane, C10H24N4), has been determined from synchrotron data. The asymmetric unit comprises of one [Cr(NCS)2(cyclam)]+ cation, one half of a Cr2O72- anion (completed by inversion symmetry) and one half of a water mol-ecule (completed by twofold rotation symmetry). The CrIII ion is coor...
In the title complex, [Cu(NCS)(2)(C(12)H(19)N(3))], the Cu(II) atom is five-coordinated in a square-pyramidal geometry defined by one pyridine N, one imine N, and one amine N atom of the tridentate Schiff base ligand and two N-bonded thio-cyanate ions (one of the latter occupying the apical site). The three bridging C atoms and the two terminal C atoms of the Schiff base are disordered over two...
In order to investigate the effect of the alpha beta subunit contacts on the subunit structure of human adult methemoglobin, the hyperfine shifted proton NMR spectra of several high spin complexes (water, cyanate, thiocyanate, formate, fluoride, and nitrite) and low spin complexes (imisazole, azide, and cyanide) of hemoglobin and its isolated subunits were characterized at 220 MHz and 22 degree...
In the title polymeric complex, [Co(NCS)(2){SC(NH(2))(2)}(2)](n), the asymmetric unit comprises a Co(II) ion, which is situated on an inversion centre, an N-bound thio-cyanate anion and a μ(2)-bridging thio-urea mol-ecule. The Co(II) atom is coordinated in a distorted octa-hedral fashion within an N(2)S(4) donor set. The bridging thio-urea ligands link Co(II) ions into a polymeric chain extendi...
In the crystal structure of the title compound, [Co(NCS)2(C6H8N2)2(H2O)2]·C6H8N2, the Co(II) cation is coordinated by the N atoms of two terminal thio-cyanate anions, the O atoms of two water mol-ecules and two N atoms of two 2,6-di-methyl-pyrazine ligands. The coordination sphere of the resulting discrete complex is that of a slightly distorted octa-hedron. The asymmetric unit comprises a Co(I...
In the title compound, [Ni(NCS)2(C5H5N)2] n , the Ni(2+) cation is coordinated by four thio-cyanate anions (μ-1,3) and two pyridine ligands within a slightly distorted octa-hedral configuration. The Ni-N bond lengths to the pyridine rings are 2.1189 (17) and 2.1241 (17) Å, whereas those to the thiocyanate anions are 2.0299 (18) and 2.0359 Å. The Ni-S bond lengths are 2.5357 (6) and 2.5568 (6) Å...
The reaction of nickel(II) thio-cyanate with an excess of pyridazine leads to single crystals of the title compound, [Ni(NCS)(2)(C(4)H(4)N(2))(4)]·2C(4)H(4)N(2). The Ni(II) cations are coordinated by two terminal N-bonded thio-cyanate anions (trans) and four pyridazine ligands in a slightly distorted octa-hedral geometry. The discrete complexes are arranged into layers parallel to the ab plane ...
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