Solvothermal synthesis and characterization of tris(ethylenediamine)nickel(II) hexaselenodistannate(IV) (original) (raw)
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Journal of Structural Chemistry, 1992
The x-ray crystal structure of Ni(en)2(NCS)2 (I) is redetermined and that of its metastable polymorphic modification (II) is determined. The refined constants of I are a = 10.176(2), b = 8.203(2), c = 8.791(2) ~, $ = 120.99(2) ~ , V = 629.1(3) ~, space group P21/a, Z = 2, dcalc= 1.558 g/cm 3. Crystals of II are monoclinic, a = 6.047 , b = 7.340(2), c = 14.365(3) ~, ~ = 91.90(2) ~ , V = 637.2 ~3, space group P2 I, Z = 2, dcalc= 1.538 g/cm 3. The metals in the complexes have octahedral coordination. The ethylenediamine ligands are in the gauche conformation. The complexes in both structures have the KK' conformation. The total van der Waals intermolecular interaction energy is determined for both modifications. A crystallographic link between the structures of I and II is demonstrated.
Transition Metal Chemistry, 2016
A hexadentate dibasic thioether N 2 O 2 S 2 donor ligand (H 2 L) and its octahedral nickel(II) complex, [Ni(L)] have been synthesized and characterized by physicochemical and spectroscopic techniques. The structures of both H 2 L and its nickel complex were confirmed by singlecrystal X-ray diffraction studies. The cyclic voltammogram of the complex shows a quasi-reversible Ni(II)/Ni(III) oxidation couple (E 1/2 = 0.88 V) along with a ligandbased reduction (E 1/2 =-0.83 V). The electronic structures and electrochemical properties have been interpreted with the help of DFT calculations. The electronic transitions as calculated by TDDFT/CPCM method are used to assign the UV-Vis absorption bands.
N,N'-bis(2-thiobenzylidene)-1,2-dimethyl-4,5-phenylenediaminato nickel( II), Ni(tsaldimph)
1996
{2,2'-[4,5-Dimethyl-1,2-phenylenebis(nitrilomethylidyne-N) ]bis(thiophenolato-S) }nickel(II), [Ni(C22HI8N2S2)], is a square-planar NiN2S2 complex, formed from a Schiff base reaction of 2-tert-butylthiobenzaldehyde with 1,2-dimethyl-4,5-phenylenediamine, followed by coordination with nickel tetrafluoroborate. It crystallizes in the orthorhombic space group Pbcn, with Ni-N distances of 1.920(3)A and Ni-S distances of 2.174 (1) ~,.
Inorganic Chemistry, 1992
The tris(thioxanthate)nickel(II) salt [Et4N] [Ni(t~n)~] has been synthesized. The S,-coordinated bivalent metal center (2.97 ps) is oxidizable, the El,, of the Ni"'(txn),-NilI(txn); couple being 0.09 V vs SCE (CH2C12, 253 K). The frozen-solution (77 K) EPR spectrum of electrogenerated Ni(txn), is compatible with the d$ ground state (g,,, 2.083; g, components, 2.122 and 2.146). At ambient temperature Ni(txn)< undergoes a facile spontaneous decomposition, affording the dimeric complex Ni2(SEt),(CS3)?-. A rationale for this transformation is proposed. The structure of [Et4N],[Ni,(SEt),(CS,),1 is reported: a = 31.279 (9) A, b = 13.670 (5) A, c = 16.900 (4) A, 6 = 102.63 (2)', V = 7050 (4) A', R = 0.0733, R, = 0.0720, space group C2/c, and Z = 8. In the dimeric anion, the metal atoms are thiolato bridged and one CS3,-ligand is chelated to each metal center. The average Ni-S(che1ate) and Ni-S(bridge) lengths are 2.173 (6) and 2.189 (5) A, respectively; the Ni-Ni contact (d) is 2.767 (3) A. The dihedral angle (a) between the two edge-sharing NiS, planes is 11 1.1 (2)O. In a group of complexes having this structural feature, d correlates linearly with sin (4 2) .
Inorganic Chemistry Communications, 2010
The structure of the tetradentate sulphur-nitrogen chelating agent, 1,2-phenylenebis(methylene) bis(1methylhydrazinecarbodithioate) (NSSN) has been determined by X-ray diffraction. In the solid state, the two arms of the ligand remain in E configurations about the hydrazinic C-N bonds. The ligand reacts with hydrated nickel(II) salts in a 3:2 ligand-to-metal ratio yielding dimeric triple helical complexes of general formula, [Ni 2 (NSSN) 3 ]X 4 ·nH 2 O (X = Cl, Br, I, NCS; n = 5, 6, 9) which contain two nickel(II) ions in distorted octahedral environments. An X-ray crystallographic structure determination of the [Ni 2 (NSSN) 3 ]Cl 4 ·9H 2 O complex shows that it is a metallomacrocycle in which each ligand acts as a bis-bidentate chelating agent providing NS donors of one arm to one nickel(II) ion and NS donors of the second arm to a second nickel(II) ion. Each nickel(II) ion adopts a distorted octahedral geometry with a NiN 3 S 3 coordination core as shown by their common electronic spectra.
Diaquasulfato(2,4,6-tri-2-pyridyl-1,3,5-triazine)nickel(II) dihydrate
Acta Crystallographica Section E Structure Reports Online, 2006
The title compound, [Ni(SO4)(C18H12N6)(H2O)2]·2H2O, is isostructural with the zinc and cobalt analogues already reported in the literature. The compound is monomeric, with an octahedral Ni centre coordinated by a tridentate 2,4,6-tri-2-pyridyl-1,3,5-triazine ligand, two water molecules and a monodentate sulfate ligand. The presence of two additional water molecules of crystallization leads to a total of eight hydrogen-bond donors, from which a very complex hydrogen-bonding scheme is built up.
trans -Bis[ N -(2-hydroxyethyl)ethylenediamine-κ 2 N , N ′]bis(isothiocyanato-κ N )nickel(II)
Acta Crystallographica Section C Crystal Structure Communications, 2004
Cu 2+ and VO 2+ doped single crystals of [Co(sac) 2 (H 2 O) 4 ]·2H 2 O (Cosacaqua) complex were investigated using EPR technique at ambient temperature. Detailed investigation of the EPR spectra indicated that the Cu 2+ and VO 2+ substitute the Co 2+ . Two sites were observed for Cu 2+ and VO 2+ . But each site of V 4+ corresponds two different orientations of VO 2+ . The principal values of the g and the hyperfine tensors were obtained. The spectra indicate that the ground state for Cu 2+ is mainly 3d x 2 −y 2 . The covalent bonding parameters for Cu 2+ and VO 2+ and Fermi contact terms were obtained.