Polymere Dimethyl-und Diphenylglyoximatokomplexe des Cobalts und Eisens mit Pyrazin als Brückenligand. Die Kristallstruktur des Bis(dimethylglyoximato)pyrazin-cobalt(II) + / Polymeric Dimethyl-and Diphenylglyoximato Complexes of Cobalt and Iron with Pyrazine as a Bridging Ligand. The Crystal Structure of Bis(dimethylglyoximato)pyrazine Cobalt(II)+

1981 ◽  
Vol 36 (4) ◽  
pp. 441-446 ◽  
Author(s):  
Frank Kübel ◽  
Joachim Strähle
Keyword(s):  
Crystal Structure ◽  
Mössbauer Spectra ◽  
Local Symmetry ◽  
Space Group ◽  
Mossbauer Spectra ◽  
Bridging Ligand ◽  
Linear Chains ◽  
Square Planar ◽  
Fe Complexes

Abstract Polymeric bis(dimethyl-and diphenylglyoximato)-complexes of Fe(II) and Co(II) with pyrazine as a bridging ligand have been synthesized. The Co(II) complexes are para-magnetic with μ = 1.83 B.M., and surprisingly stable against oxidation. Bis (dimethyl-glyoximato)pyrazine-cobalt (II) crystallizes monoclinic in the space group C2/m with Z = 2. The crystal structure shows linear chains of alternating Co atoms and pyrazine ligands. Perpendicular to the chain, the Co atoms are coordinated in a square planar arrangement by two dimethylglyoximato ligands (Co-N= 189 pm), the local symmetry being C2h-The long Co-pyrazine distance of 224 pm is in agreement with the fact that the compound is a 19 electron complex. The Co complexes do not have conducting properties. The Fe(II) complexes possess the same structure but with stronger bonds in the chain. They show very low conductivity of approximately 10-10 cm -1 Ω-1 . The Mössbauer spectra of the Fe-complexes are reported.

Polymere Dimethyl-und Diphenylglyoximatokomplexe des Cobalts und Eisens mit 4.4′ -Bipyridin als Brückenligand. Die Kristallstruktur des Bis(dimethylglyoximato)4.4′-bipyridincobalt(II)*/ Polymeric Dimethyl-and Diphenylglyoximato Complexes of Cobalt and Iron with 4,4′-Bipyridine as a Bridging Ligand. The Crystal Structure of Bis(dimethylglyoximato)4,4′-bipyridine Cobalt(II)

1982 ◽  
Vol 37 (3) ◽  
pp. 272-275 ◽  
Author(s):  
Frank Kübel ◽  
Joachim Strähle
Keyword(s):  
Crystal Structure ◽  
Metal Complexes ◽  
Iron Complexes ◽  
Local Symmetry ◽  
Space Group ◽  
Bridging Ligand ◽  
Linear Chains ◽  
Bipyridine Ligand ◽  
Electrical Conductors

Polymeric bis(dimethyl- and diphenylglyoximato)-complexes of Fe(II) and Co(II) with 4,4′-bipyridine as a bridging ligand have been synthesized from the glyoximato metal complexes and 4,4′-bipyridine in ethanol. The Co(II) compounds are paramagnetic and surprisingly stable against oxidation. The iron complexes are weak electrical conductors with approximately 10-9 Ω-1cm-1 . Bis(dimethylglyoximato)-4,4′-bipyridine cobalt(II) crystallizes triclinic in the space group PT with Z=1. The crystal structure is built up by linear chains of alternating Co(II) glyoximato complexes and axial bonded 4,4′-bipyridine bridges. The compound is characterized by strong Co-N-bonds of 189 pm within the glyoximato moiety and weak bonds of 228 pm to the bipyridine ligand. The two heterocycles of the bipyridine are coplanar, therefore the local symmetry of the complex is D2h.

The preparation and characterisation of Sb3Cl11F4

1977 ◽  
Vol 55 (5) ◽  
pp. 743-748 ◽  
Author(s):  
Jack G. Ballard ◽  
Thomas Birchall ◽  
David R. Slim
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Mössbauer Spectra ◽  
Three Dimensional ◽  
Chlorine Atoms ◽  
Space Group ◽  
X Ray ◽  
Mossbauer Spectra ◽  
Final Agreement

The title compound has been prepared by the reaction of SbF5 and SbCl5 in liquid SO2. Raman and Mössbauer spectra have been recorded and its crystal structure determined by three-dimensional X-ray counter measurements. Crystals are monoclinic with a = 12.359(6) Å, b = 16.480(10) Å, c = 9.387(3) Å, β = 103.96(5)°. The structure has been refined in the space group P21/n to a final agreement index R2 of 0.113 for 2415 independent reflections. The structure consists of a cis fluorine-bridged trimer with one of the chlorine atoms 25% substituted by fluorine.

scholarly journals Kristallstruktur- und MoBbauer-Untersuchungen am Lithiumhexacyanoferrat(III)-Hexamethylentetramin-Addukt Li3[Fe(CN)6] ·2C6H12N4 · 5H20 / Crystal Structure and Mossbauer Studies of the Lithium Hexacyanoferrate(III)-Hexamethylenetetramine Adduct Li3[Fe(CN)6] · 2C6H12N4 · 5H2O

1984 ◽  
Vol 39 (9) ◽  
pp. 1162-1166 ◽  
Author(s):  
Joachim Pickardt ◽  
Jorg Kahler ◽  
Norbert Rautenberg ◽  
Erwin Riedel
Keyword(s):  
Crystal Structure ◽  
Mössbauer Spectra ◽  
Statistical Distribution ◽  
Water Molecules ◽  
Orthorhombic Space Group ◽  
Lithium Ions ◽  
Space Group ◽  
Mössbauer Studies ◽  
Temperature Range ◽  
Mossbauer Spectra

Crystals of the adduct Li3[Fe(CN)6] · 2C6H12N4-5H2O are orthorhombic, space group I2mm, Z = 2, a = 909.4(5), b = 1046.1(5), c = 1455.8(5) pm. The structure may be regarded as a packing of Fe(CN)6 octahedra and hexamethylenetetramine molecules. The lithium ions are coordinated to nitrogen atoms of both groups and to water molecules. Mossbauer spectra have been recorded for the temperature range between 290 K and 77 K. At all temperatures the spectra show two doublets with nearly identical isomer shifts but different quadrupole splittings, thus indicating the presence of two kinds of hexacyanoferrate(III) ions with slightly different distortions of the ligand spheres around the Fe atoms. The effect is discussed on the assumption of a statistical distribution of one of the lithium ions.

Synthesis, Crystal Structure And Spectroscopic Studies Of A Mixed Ligand Copper (Ii) Complex: Trans-Bis(Succinimidato)-Bis(Benzylamino)Cu(Ii)

2006 ◽  
Vol 61 (8) ◽  
pp. 979-982 ◽  
Author(s):  
Murat Taş ◽  
Hanife Saraçoğlu ◽  
Hümeyra Bati ◽  
Nezihe Çalışkan ◽  
Orhan Büyükgüngör
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Spectroscopic Studies ◽  
Mixed Ligand ◽  
Interplanar Angle ◽  
Space Group ◽  
Square Planar

The molecules of the title compound, [Cu(C11H13N2O2)2], lie across centres of inversion in space group P21/c and are linked by intermolecular N-H···O and C-H···O hydrogen bonds. The central Cu atom has a slightly distorted square-planar coordination comprised of four N atoms. Cu-N bond distances are 1.975(2) and 2.020(2) Å . The interplanar angle between the phenyl and succinimidato ring is 87.34(10)°

scholarly journals Weitere Verbindungen mit isolierten quadratischen PdO4-Polygonen: BaPdLn2O5 (Ln=Eu, Gd, Dy, Ho) / Compounds Containing Isolated Square Planar PdO4 Polygons: BaPdLn2O5 (Ln=Eu, Gd, Dy, Ho)

1996 ◽  
Vol 51 (4) ◽  
pp. 461-464 ◽  
Author(s):  
Hk. Müller-Buschbaum ◽  
L. Wulff
Keyword(s):  
Crystal Structure ◽  
Space Group ◽  
Square Planar ◽  
New Compounds ◽  
Group D

Abstract New compounds of the composition BaPdLn2O5 (Ln = Eu, Gd, Dy, Ho) have been prepared by crystallization from flux. They crystallize isotypic to BaPtLn2O5, space group D54h-P4/ mbm. Eu: a = 6.6359(6), c = 5.885(3) Å ; Gd: a = 6.608(3), c = 5.873(3) Å ; Dy: a = 6.5431(7), c = 5.8574(8) Å ; Ho: a = 6.522(4), c = 5.855(5) A , Z = 2. The crystal structure is characterized by isolated planar PdO4 polygons incorporated into a framework of edge-and corner-sharing doubly capped BaO8 cubes and edge-and face-sharing LnO6 prisms.

Synthesis and Properties of a New Kind of One-Dimensional Conductors. 1. General Aspects

1979 ◽  
Vol 34 (8) ◽  
pp. 983-985 ◽  
Author(s):  
Michael Hanack ◽  
Friedrich Franz Seelig ◽  
Joachim Strähle
Keyword(s):  
Experimental Studies ◽  
Bidentate Ligand ◽  
Central Metal Atom ◽  
Central Metal ◽  
Bridging Ligands ◽  
One Dimensional ◽  
Bridging Ligand ◽  
Linear Chains ◽  
Square Planar ◽  
General Aspects

AbstractA model for a new kind of one-dimensional conductors is presented. The compounds consist of square-planar metal complexes MX4 which are polymerised via bridging ligands L to linear chains. The bidentate ligand L, e.g. C22-, leads to the formation of a linear π-system along the chain, which is essential for the conductivity. The square-planar complex can be, for example, a metal phthalocyanine. MO-calculations show that this kind of polymer gives rise to a suitable energy band structure. An advantage of the new one-dimensional conductors is their flexibility; different combinations of the square-planar ligand system, the bridging ligand, and the central metal atom can be used. First experimental studies show that the preparation of the proposed conductors is possible.

scholarly journals Die Kristallstruktur des Silbertetrachloroaurats(III) AgAuCl4 und seine kristallchemische Verwandtschaft zum Rubidiumtetrachloroaurat(III) RbAuCl4 / The Crystal Structure of Silver Tetrachloroaurate(III) AgAuCl4 and its Crystal Chemical Relationship to the Rubidium Tetrachloroaurate(III) RbAuCl4

1977 ◽  
Vol 32 (7) ◽  
pp. 741-744 ◽  
Author(s):  
Walther Werner ◽  
Joachim Strähle
Keyword(s):  
Crystal Structure ◽  
Bond Length ◽  
Octahedral Coordination ◽  
Monoclinic Space Group ◽  
Crystal Chemical ◽  
Space Group ◽  
Square Planar ◽  
Cl Atoms

AgAuCl4 crystallizes in the monoclinic space group I2/c with Zi = 4. The crystal structure is built up by Ag+ cations and square planar AuCl4⁻ anions with Au-Cl bond length of 228 pm. The Ag+ ions have an octahedral coordination of Cl atoms. AgAuCl4 is topologically related to RbAuCl4.

scholarly journals Einkristallzüchtung und Röntgenstrukturanalyse polymerer 1:1-Komplexe von CuBr2 und CuCl2 mit Pyrazin aus Gelen / Crystal Growth in Gels and X-Ray Characterization of Polymeric 1:1-Complexes of CuBr2 and CuCl2 with Pyrazine

1989 ◽  
Vol 44 (5) ◽  
pp. 553-556 ◽  
Author(s):  
Th. Fetzer ◽  
A. Lentz ◽  
T. Debaerdemaeker
Keyword(s):  
Crystal Structure ◽  
Thermal Decomposition ◽  
Crystal Growth ◽  
Chloro Complex ◽  
Monoclinic Space Group ◽  
Crystal Data ◽  
Space Group ◽  
X Ray ◽  
Linear Chains

Single crystals of Cu(pz)Br2 and Cu(pz)Cl2 were grown by using gel methods with tetramethoxysilane as the gel-forming reagent. Thermal decomposition is interpreted. Crystal data for the bromo complex: monoclinic, space group C2/m with a = 1239.2(3) pm, b = 685.9(2) pm, c = 390.7(3) pm, β = 96,23(5)°. Crystal data for the chloro-complex: monoclinic, space group C2/m with a = 1197.1(3) pm, b = 684.9(3) pm, c = 370.1(3) pm, β = 95.96(5)°. Crystal structure analyses reveal that CuHal2 molecules are bonded by pyrazine to form linear chains. These chains are cross-linked by bridging halogen atoms.

scholarly journals Darstellung und Kristallstruktur von Palladiumoxidchlorid Pd2OCl2/Preparation and Crystal Structure of Palladium Oxide Chloride Pd2OCl2

1986 ◽  
Vol 41 (11) ◽  
pp. 1363-1366 ◽  
Author(s):  
Beate Dannecker ◽  
Gerhard Thiele
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Palladium Oxide ◽  
Compound A ◽  
Space Group ◽  
Square Planar ◽  
The Relationship

Abstract Pd2OCl2 was obtained by reaction of γ-PdCl2 and PdO·nH2O in a KNO3/NaNO3 melt at 450 °C. Single crystals were grown from a TlCl flux. The crystal structure of the tetragonal compound (a = 631.3(2) pm, c = 987.2(2) pm, space group I41 /amd) is built up from bands of edge shared square planar PdO2Cl2 groups connected by common O-atoms to a framework. The relationship between the structures of Pd2OCl2 and PdO is discussed.

Purine complexes of platinum: synthesis, nmr, and crystal and molecular structures of cis-chloro(caffeine)bis(triethylphosphine)platinum(II) fluoroborate and cis-bis(isocaffeine)bis(triethylphosphine)platinum (II) fluoroborate

1983 ◽  
Vol 61 (6) ◽  
pp. 1132-1141 ◽  
Author(s):  
Gordon William Bushnell ◽  
Roderick James Densmore ◽  
Keith Roger Dixon ◽  
Arthur Charles Ralfs
Keyword(s):  
Crystal Structure ◽  
Nmr Spectra ◽  
Molecular Structures ◽  
Platinum Drugs ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Bond Lengths ◽  
Antitumour Agents ◽  
Crystal And Molecular Structures ◽  
Square Planar

Synthesis and 31P nmr spectra of the complex cations, cis-[PtCl(L)(PEt3)2]+, L= theophylline, caffeine, or isocaffeine, and cis[Pt(isocaff)2(PEt3)2]2+ are reported. The crystal structure of cis-[PtCl(caffeine)(PEt3)2][BF4] is determined, space group [Formula: see text], a = 1.1766(6), b = 1.4428(5), c = 0.9002(4) nm, α = 97.28(4)°, β = 97.69(4)°, γ = 100.96(5)°, Dm = 1.649 g cm−1, the bond lengths are Pt—Cl= 233.4(4) pm, Pt—N = 215(1) pm, Pt—P = 225.4(5) pm (mean), and the residual R = 0.071. The crystal structure of cis-[Pt(isocaffeine)2(PEt3)2][BF4]2 is orthorhombic, space group Pbca, a = 2.317(3), b = 1.717(3), c = 2.130(3) nm, Dm = 1.574 g cm−3, with an opposing isocaffeine conformation, bond lengths Pt—N = 211(2) pm, Pt—P = 227.6(9) pm (mean), and R = 0.073. Both crystal structures contain approximately square planar Pt(II) coordination with the purine coordinated via an imidazole nitrogen. The structures are discussed as models for the possible involvement of [Formula: see text] chelation of guanine to platinum when platinum drugs act as antitumour agents, but there is no evidence that isocaffeine acts as an [Formula: see text] chelate.

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