Characterization of the full matrix constants of Bi4Ti3O12 ceramics

2021 ◽  
Author(s):  
Wei Wang ◽  
Kang Zheng ◽  
Shanshan Sun ◽  
Lei Qin ◽  
Liguo Tang ◽  
...  
Keyword(s):  
Full Matrix ◽  
Bi4ti3o12 Ceramics

Structural Systematics of Rare Earth Complexes. VII. Crystal Structure of Bis(2,2'/6',2␛-Terpyridinium) Octaaquaterbium(III) Heptachloride Hydrate

1994 ◽  
Vol 47 (2) ◽  
pp. 391 ◽  
Author(s):  
CJ Kepert ◽  
BW Skeleton ◽  
AH White
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Single Crystal ◽  
Structural Characterization ◽  
Title Compound ◽  
Room Temperature ◽  
Chloride Ions ◽  
Full Matrix ◽  
X Ray

The room-temperature single-crystal X-ray structural characterization of the title compound (tpyH2)2[Tb(OH2)8]Cl7.~2⅓H2O is recorded. Crystals are triclinic, Pī , a 17.063(5), b 16.243(3), c 7.878(3) Ǻ, α 84.78(2), β 84.39(3), γ 87.81(2)°, Z = 2 formula units; 3167 'observed' diffractometer reflections were refined by full-matrix least-squares procedures to a residual of 0.057. Notable features of interest of the compound are the 'chelation' of chloride ions by the terpyridinium cations , and the existence of a free [Tb(OH2)8]2+ cation in the presence of an abundance of chloride ions.

Synthesis and Structure of cis-Dioxobis(pyrimidine-2-thiolato-N,S)molybdenum(VI)

1992 ◽  
Vol 45 (11) ◽  
pp. 1933 ◽  
Author(s):  
PR Traill ◽  
AG Wedd ◽  
ERT Tiekink
Keyword(s):  
Least Squares ◽  
Octahedral Geometry ◽  
Distorted Octahedral Geometry ◽  
Monoclinic Space Group ◽  
Full Matrix ◽  
X Ray ◽  
Distorted Octahedral ◽  
Cell Dimensions ◽  
Unit Cell Dimensions

The characterization of two MoVI complexes, cis -[MoO2(2-pymS)2] and cis -[MoO2(2-pyS)2] (where 2-pymSH is pyrimidine-2-thiol and 2-pySH is pyridine-2-thiol), and their reaction with Ph3P are reported. The X-ray structure of cis -[MoO2(2-pymS)2] shows the molybdenum atom to exist in a distorted octahedral geometry defined by two mutually cis oxygen atoms and two chelating 2-pymS ligands so that the two sulfur atoms occupy approximate trans positions. Crystals of cis -[MoO2(2-pymS)2] are monoclinic, space group P 21/n, with unit cell dimensions: a 9.301(3), b 12.121(2), c 11.303(3) �, β 112.62(3)�, V 1176.3 �3, Z 4. The structure was refined by a full-matrix least-squares procedure to R 0.067 for 1858 reflections with I ≥ 2.5 (I).

UHF FLOWS AND COCYCLES

2012 ◽  
Vol 23 (01) ◽  
pp. 1250018
Author(s):  
A. KISHIMOTO
Keyword(s):  
Explicit Construction ◽  
Inductive Limits ◽  
Full Matrix ◽  
Matrix Algebras

UHF flows are the flows obtained as inductive limits of flows on full matrix algebras. We will revisit universal UHF flows and give an explicit construction of such flows on a UHF algebra Mk∞ for any k and also present a characterization of such flows. Those flows are UHF flows whose cocycle perturbations are almost conjugate to themselves.

Photochemically Induced C-H Bond Activation and Ligand Transfer in the Reaction of [Cp2Rh2(CO)(CF3C2CF3)] With [(Cp′) Mn (CO)2( thf )]: Structural Characterization of the Rh4 Product

1994 ◽  
Vol 47 (8) ◽  
pp. 1613 ◽  
Author(s):  
RS Dickson ◽  
MJ Liddell ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Room Temperature ◽  
Bond Activation ◽  
X Ray Diffraction ◽  
Full Matrix ◽  
X Ray ◽  
Corrected Data ◽  
Ligand Transfer ◽  
Hydrocarbon Solution ◽  
Induced Reaction

A room-temperature single-crystal X-ray diffraction study carried out on a product of a sunlight induced reaction between [Cp2Rh2(CO)(CF3C2CF3)] and [(Cp′) Mn (CO)2( thf )] in 2:1 ratio in hydrocarbon solution establishes it to be tetranuclear [(Cp4Rh4)(CF3C=CHCF3)2(CH3-C5H3)]; crystals of the latter are triclinic, Pī , a 15.803(9), b 13.445(8), c 8.966(6) Ǻ, α 75.92(5), β 80.68(5), γ 65.46(4)°, Z = 2. Full-matrix refinement for 3431 'observed' [I > 3σ(I)], absorption-corrected data converged at R 0.056. The structure comprises a pair of enantiomeric [(Cp2Rh2)(CF3C=CHCF3 binuclear units unsymmetrically linked by the central CH3C5H3 ring, by way of the η1,η2-C=CH and η1,η2-C= CMe functionalities.

Synthesis and characterization of octahedral and trigonal bipyramidal transition metal complexes incorporating chelating gallate ligands: crystal and molecular structure of [Me2Ga(N2C5H7)(OCH2CH2NMe2)]Ni[(N2C5H7)2GaMe2]

1980 ◽  
Vol 58 (11) ◽  
pp. 1091-1100 ◽  
Author(s):  
Kenneth S. Chong ◽  
Steven J. Rettig ◽  
Alan Storr ◽  
James Trotter
Keyword(s):  
Molecular Structure ◽  
Transition Metal ◽  
Transition Metal Complexes ◽  
Crystal And Molecular Structure ◽  
Synthesis And Characterization ◽  
Chelating Ligands ◽  
Full Matrix ◽  
Trigonal Bipyramidal ◽  
Distorted Trigonal Bipyramidal

The preparation and physical properties of octahedral and trigonal bipyramidal complexes incorporating the tris-chelating ligands [Me2Ga(N2C5H7)(OCH2CH2NR′2)]− (R′ = H or Me) are described. Crystals of [dimethylbis(3,5-dimethyl-1-pyrazolyl)gallato (N(2),N′(2))][dimethyl (3,5 - dimethyl-1-pyrazolyl) (N,N-dimethylethanolamino(gallato (N(2), O, N(3))]nickel(II) are triclinic, a = 20.8562(11), b = 9.1536(4), c = 8.2798(4) Å, α = 100.204(3), β = 85.513(4), γ = 101.989(3)°, Z = 2, space group [Formula: see text]. The structure was solved by Patterson and Fourier syntheses and was refined by full-matrix least-squares procedures to R = 0.048 and Rw = 0.078 for 5508 reflections with I ≥ 3σ(I). The coordination about the Ni atom is distorted trigonal bipyramidal with the two nitrogen atoms from the Me2Ga(N2C5H7)2 ligand occupying equatorial positions. The tridentate Me2Ga(N2C5H7)(OCH2CH2NMe2) ligand is meridionally coordinated with the oxygen in the equatorial and the two nitrogens in the axial positions. Important bond lengths (corrected for libration) are: Ni—N(eq), 2.005(3) and 2.006(3), Ni—O, 1.993(3), Ni—N(pz—ax), 2.072(3), Ni—N(amino), 2.229(3), Ga—O, 1.913(3), Ga—N, 1.971(3)–1.989(3), and Ga—C, 1.961(10)–1.986(6) Å.

Synthesis and characterization of molybdenum–tin complexes derived from the molybdenum tricarbonyl anion, [MeGapz3]Mo(CO)3−, and organotin chlorides. X-ray crystal structure of [MeGapz3]Mo(CO)3SnPh3 (where pz = pyrazolyl, N2C3H3)

1986 ◽  
Vol 64 (2) ◽  
pp. 321-327 ◽  
Author(s):  
Emmanuel C. Onyiriuka ◽  
Steven J. Rettig ◽  
Alan Storr
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Heavy Atom ◽  
Synthesis And Characterization ◽  
Full Matrix ◽  
X Ray ◽  
Tin Complexes ◽  
Interesting Solution ◽  
Single Bonds

The reaction of the molybdenum tricarbonyl anion, [MeGapz3]Mo(CO)3−, with the organotin chlorides, Ph3SnCl, Me3SnCl, and Me2SnCl2, has yielded a series of complexes in which direct Mo—Sn single bonds are featured. The [MeGapz3]Mo(CO)3SnMe2Cl complex shows an interesting solution behavior in which a transition from a 3:4, or piano stool structure, to a 3:3:1, or capped octahedral arrangement, is thought to occur. The 3:3:1 structure has been demonstrated in the solid state for the [MeGapz3]Mo(CO)3SnPh3 compound by means of a crystal structure determination. Crystals of [methyltris(1-pyrazolyl)gallato-N,N,N](triphenylstannyl)tricarbonylmolybdenum are monoclinic, a = 11.4439(8), b = 19.5116(8), c = 15.2686(12) Å β = 111.370(3)°, Z = 4, space group P21/c. The structure was solved by conventional heavy-atom methods and was refined by full-matrix least-squares procedures to R = 0.025 and Rw = 0.031 for 5259 reflections with I ≥ 3σ(I). Important bond lengths include: Mo—Sn = 2.8579(3), Mo—N = 2.239(2)–2.244(2), Mo—C = 1.967(3)–2.000(3), Sn—C = 2.151(3)–2.166(3), Ga—N = 1.920(3)–1.931(3), and Ga—C = 1.943(4) Å.

Preparation and characterization of the osmium cluster complexes H2Os3(CO)8L(EtFcPCMe) (L = CO or PEt2Fc) and H2Os3(CO)8[(η-C5H3PEt2)Fe(η-C5H4)]

1993 ◽  
Vol 71 (3) ◽  
pp. 399-409 ◽  
Author(s):  
William R. Cullen ◽  
Steven J. Rettig ◽  
Tu Cai Zheng
Keyword(s):  
Least Squares ◽  
Heavy Atom ◽  
Molar Ratio ◽  
Asymmetric Unit ◽  
Full Matrix ◽  
Space Group ◽  
Cluster Complexes ◽  
Unit Space

Thermolysis of Os3(CO)11(PEt2Fc) (Fc = (η-C5H4)Fe(η-C5H5)) in octane for 8 h affords H2Os3(CO)9(EtFcPCMe), 10, and H2Os3(CO)8[(η-C5H3PEt2)Fe(η-C5H4)], 9e, in 15 and 65% yield, respectively. Heating Os3(CO)12 and PEt2Fc in 1:2 molar ratio in xylene for 10 h gives two isomers of H2Os3(CO)8(PEt2Fc)(EtFcPCMe), 11, in about 40% yield. Two crystalline modifications of the complex 9e have been obtained from the same solvent: 9eA, triclinic, a = 15.653(1), b = 15.799(1), c = 11.257(1) Å, α = 90.388(7)°, β = 109.740(6)°, γ = 82.445(6)°, Z = 4 (two molecules per asymmetric unit), space group [Formula: see text]; and 9eB, monoclinic, a = 9.889(2), b = 13.632(3), c = 18.927(4) Å, β = 97.36(2)°, Z = 4, space group P21/n. The structures were solved by heavy atom methods and were refined by full-matrix least-squares procedures to R = 0.033 and 0.037 for 8131 and 5145 reflections with I ≥ 3σ(I), respectively.

Synthesis of meso-phenyl-4,6-dipyrrins, preparation of their Cu(II), Ni(II), and Zn(II) chelates, and structural characterization of bis[meso-phenyl-4,6-dipyrrinato]Ni(II)

1996 ◽  
Vol 74 (11) ◽  
pp. 2182-2193 ◽  
Author(s):  
Christian Brückner ◽  
Veranja Karunaratne ◽  
Steven J. Rettig ◽  
David Dolphin
Keyword(s):  
Dihedral Angle ◽  
Direct Methods ◽  
Metal Chelates ◽  
Central Metal ◽  
Full Matrix ◽  
X Ray ◽  
X Ray Crystallography ◽  
Transition Metal Chelates ◽  
Square Planar

meso-Phenyldipyrromethanes can be oxidized by 2,6-dicyano-3,5-dichloro-para-benzoquinone (DDQ) to the corresponding meso-phenyldipyrrins. As expected, these novel, stable bipyrrolic pigments readily form metal chelates with copper(II), nickel(II), and zinc(II). Their UV–VIS spectra are compared with a series of known alkyl-substituted dipyrrin chelates and, based on the UV–VIS spectral analysis, the dihedral angle between the two ligands in the bis[meso-phenyldipyrrinato]Ni(II) complex was calculated to be 42°. The molecular structure of this complex was determined by X-ray crystallography, essentially confirming the calculation. Crystals of C30H22N4Ni are orthorhombic, a = 17.156(3), b = 35.217(1), c = 7.886(1) Å, Z = 8, space group Fddd. The structure was solved by direct methods and refined by full-matrix least-squares procedures to R = 0.040 and Rw = 0.031 for 1058 reflections with I ≥ 3σ(F2). The central nickel is coordinated in a distorted square-planar fashion by four nitrogens. The pair of the planar dipyrrinato ligands enclose a dihedral angle of 38.5°. This is the lowest angle reported for nickel(II) complexes of this kind. As a result of this, and in sharp contrast to previously described nickel(II) dipyrrin chelates, the central metal is diamagnetic. Key words: meso-phenyldipyrromethanes, meso-phenyldipyrrins, meso-phenyldipyrrinato transition metal chelates, X-ray crystallography.

Synthesis and structural characterization of two triclinic modifications of diethylammonium trans-tetrachlorobis(dimethylsulfoxide-S)rhodate(III): an example of hydrogen-bond acceptor structural isomerism

1988 ◽  
Vol 66 (5) ◽  
pp. 1123-1128 ◽  
Author(s):  
Sujatha N. Gamage ◽  
Brian R. James ◽  
Steven J. Rettig ◽  
James Trotter
Keyword(s):  
Hydrogen Bond ◽  
Hydrochloric Acid ◽  
Hydrogen Bonds ◽  
Hydrogen Bond Acceptor ◽  
Fourier Methods ◽  
Full Matrix ◽  
Space Group ◽  
Type Formula ◽  
Structural Isomerism

Two crystalline modifications (I and II) of diethylammonium trans-tetrachlorobis(dimethylsulfoxide-S)rhodate(III) have been isolated from the same reaction mixture. The compound is formed by hydrolysis, in the presence of hydrochloric acid, of an η1-ylidic enamine complex of rhodium(III), which is made via dehydrogenation of triethylamine in the presence of mer-trichlorotris(dimethylsulfoxide)rhodium(III). Crystals of form I are triclinic, a = 8.1787(7), b = 10.761(1), c = 10.927(1) Å, α. = 86.681(6), β = 84.879(7), γ = 71.814(8)°, Z = 2, space group [Formula: see text], and those of form II are triclinic, a = 7.931(2), b = 9.489(2), c = 13.302(2) Å, α = 102.03(1), β = 97.40(1), γ = 107.49(1)°, Z = 2, space group [Formula: see text].Both structures were solved by Patterson and Fourier methods and were refined by full-matrix least-squares procedures to R = 0.024 and 0.060 for 4959 and 4320 reflections with I ≥ 3σ(I), respectively. Both crystal structures consist of centrosymmetric [RhCl4(Me2SO)2]− anions and (NEt2H2)+ cations, linked by hydrogen bonds to form infinite chains. In form I the hydrogen bonds are all of the type [Formula: see text], while in form II they are all of the type [Formula: see text].

Synthesis and X-ray structural characterization of the ruthenium β-diketonato complexes: Ru(hfac)3, cis-Ru(hfac)2(MeCN)2, and cis-Ru(hfac)(acac)(MeCN)2

1999 ◽  
Vol 77 (11) ◽  
pp. 1821-1833 ◽  
Author(s):  
Ian R Baird ◽  
Steven J Rettig ◽  
Brian R James ◽  
Kirsten A Skov
Keyword(s):  
Cyclic Voltammetry ◽  
Elemental Analysis ◽  
Structural Characterization ◽  
Subsequent Treatment ◽  
Peroxide Oxidation ◽  
Full Matrix ◽  
Space Group ◽  
X Ray ◽  
Etoh Solution

Ru(hfac)3 (2) was synthesized via peroxide oxidation of the Ru(II) species [Na][Ru(hfac)3] (1) (hfac = 1,1,1,5,5,5-hexafluoroacetylacetonate). Treatment of either 1 or 2 with CF3SO3H in MeCN generated cis-Ru(hfac)2(MeCN)2 (3). Ru(acac)2(hfac) (4) (acac = acetylacetonate) was generated by addition of hfac to an EtOH solution of cis-[Ru(acac)2(MeCN)2][CF3SO3]. Subsequent treatment of 4 with CF3SO3H in MeCN yielded cis-Ru(acac)(hfac)(MeCN)2 (7). Syntheses of [Na][Ru(hfac)2(acac)] (5) and Ru(hfac)2(acac) (6) are also reported. The complexes were characterized generally by elemental analysis, cyclic voltammetry, UV-vis, NMR, and IR spectroscopies. The structures of 2, 3, and 7 were established by X-ray crystallographic analyses. Crystals of 2 are monoclinic with a = 8.7781(4), b = 13.0760(11), c = 19.1857(5) Å, β = 92.2275(5)°, Z = 4, and space group P21/n; those of 3 are monoclinic with a = 25.731(4), b = 8.8332(13), c = 18.1955(4) Å, β = 93.3395(6)°, Z = 8, and space group C2/c; and those of 7 are triclinic with a = 7.6812(9), b = 10.680(2), c = 12.578(2) Å, α = 88.062(6)°, β = 83.874(3)°, γ = 69.5898(15)°, Z = 2, and space group Pbar over 1. The structures were solved by Patterson methods and refined by full-matrix least-squares procedures to R(F) = 0.036, 0.035, and 0.068 (Rw(F2) = 0.061,Rw(F) = 0.052, and Rw(F) = 0.089), respectively.Key words: ruthenium, β-diketonato complexes, acetylacetonate, 1,1,1,5,5,5-hexafluoroacetylacetonate, acetonitrile complexes.

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