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.

79Br, 127I NQR of Diammoniumalkyl Halides and Piperazinium Halides. Crystal Structure of Piperazinium Dibromide Monohydrate and Piperazinium Monoiodide

1989 ◽  
Vol 44 (1) ◽  
pp. 41-55 ◽  
Author(s):  
Jutta Hartmann ◽  
Shi-Qi Dou ◽  
Alarich Weiss
Keyword(s):  
Crystal Structure ◽  
Phase Transitions ◽  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Monoclinic Space Group ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Temperature Range

Abstract The 79Br and 127I NQR spectra were investigated for 1,2-diammoniumethane dibromide, -diiodide, 1,3-diammoniumpropane dibromide, -diiodide, piperazinium dibromide monohydrate, and piperazinium monoiodide in the temperature range 77 ≦ T/K ≦ 420. Phase transitions could be observed for the three iodides. The temperatures for the phase transitions are: 400 K and 404 K for 1,2-diammoniumethane diiodide, 366 K for 1,3-diammoniumpropane diiodide, and 196 K for piperazinium monoiodide.The crystal structures were determined for the piperazinium compounds. Piperazinium dibromide monohydrate crystallizes monoclinic, space group C2/c, with a= 1148.7 pm, 0 = 590.5 pm, c= 1501.6pm, β = 118.18°, and Z = 4. For piperazinium monoiodide the orthorhombic space group Pmn 21 was found with a = 958.1 pm, b = 776.9 pm, c = 989.3 pm, Z = 4. Hydrogen bonds N - H ... X with X = Br, I were compared with literature data.

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.

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.

Die Kristallstruktur von [Ca(N3)2(H2O)2] · C6H14N4 bei 100 K /The Crystal Structure of [Ca(N3)2(H2O)2] · C6H14N4 at 100 K

1989 ◽  
Vol 44 (2) ◽  
pp. 135-138 ◽  
Author(s):  
Franz A. Mautner ◽  
Harald Krischner ◽  
Christoph Kratky
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray

Abstract The crystal structure of calcium azide dihydrate trans-bicyclo-[4.4.0]-1,4,6.9-tetraazadecane has been determined by single crystal X-ray diffraction at 100 K. [Ca(N3)2(H2O)2 (C6H14N4 crystallizes in the orthorhombic space group Pnma, Z = 4. with a - 1396.6(5), b = 1407.1(5), c = 712.2(2) pm. Calcium is hexacoordinated to four azide groups and two water molecules. The elongated octahedra are linked via μ(1,3)-bridging azide ions to form monolayers parallel to the ac-plane. The C6H14N4 molecules are arranged between these layers.

Die Kristallstruktur von [Mg(H2O)6](N3)2 / The Crystal Structure of [Mg(H2O)6](N3)2

1986 ◽  
Vol 41 (8) ◽  
pp. 935-937 ◽  
Author(s):  
Franz A. Mautner ◽  
Harald Krischner ◽  
Christoph Kratky
Keyword(s):  
Crystal Structure ◽  
Oxygen Atom ◽  
Single Crystal ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Metal Atoms

Abstract The crystal structure of [Mg(H2O)6](N3)2 was determined by single crystal X-ray diffraction (421 independent observed MoKα-counter reflections. R = 0.037). The crystals are orthorhombic, space group Fmmm, Z = 4, a = 644.3(1), b = 1134.4(1), c = 1333.5(3) pm. The magnesium atoms are octahedrally coordinated to six oxygen atom s of water molecules, the azide groups are not coordinated to metal atoms, N -N = 117.0(2) pm.

scholarly journals Three salts from the reactions of cysteamine and cystamine withL-(+)-tartaric acid

2013 ◽  
Vol 69 (6) ◽  
pp. 658-664 ◽  
Author(s):  
Amina Benylles ◽  
Donald Cairns ◽  
Philip J. Cox ◽  
Graeme Kay
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Tartaric Acid ◽  
Three Dimensional ◽  
Water Molecules ◽  
Amino Groups ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Hydrogen Bonding Networks

Reaction between cysteamine (systematic name: 2-aminoethanethiol, C2H7NS) and L-(+)-tartaric acid [systematic name: (2R,3R)-2,3-dihydroxybutanedioic acid, C4H6O6] results in a mixture of cysteamine tartrate(1−) monohydrate, C2H8NS+·C4H5O6−·H2O, (I), and cystamine bis[tartrate(1−)] dihydrate, C4H14N2S22+·2C4H5O6−·2H2O, (III). Cystamine [systematic name: 2,2′-dithiobis(ethylamine), C4H12N2S2], reacts with L-(+)-tartaric acid to produce a mixture of cystamine tartrate(2−), C4H14N2S22+·C4H4O62−, (II), and (III). In each crystal structure, the anions are linked by O—H...O hydrogen bonds that run parallel to theaaxis. In addition, hydrogen bonding involving protonated amino groups in all three salts, and water molecules in (I) and (III), leads to extensive three-dimensional hydrogen-bonding networks. All three salts crystallize in the orthorhombic space groupP212121.

127I Mössbauer studies of oxygen bonded iodine complexes. 2. Aryliodine(III)carboxylates; the crystal and molecular structure of bis(trifluoroacetato)pentafluorophenyliodine(III), (C6F5)I(O2CCF3)2

1989 ◽  
Vol 67 (11) ◽  
pp. 1878-1885 ◽  
Author(s):  
Madhumita Bardan ◽  
Thomas Birchall ◽  
Christopher S. Frampton ◽  
Pratibha Kapoor
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Crystal And Molecular Structure ◽  
Asymmetric Unit ◽  
Space Group ◽  
Mössbauer Studies ◽  
Mossbauer Spectra ◽  
Independent Molecules ◽  
Secondary Bonding ◽  
Iodine Complexes

The 127I Mössbauer spectra of a series of mono- and diaryliodine(III) carboxylates have been recorded at 4.2 K. The observed parameters are shown to be strongly dependent on the primary bonding arrangement about iodine only and the secondary bonding interactions have little or no effect. The crystal and molecular structure of bis(trifluoroacetato)pentafluorophenyliodine(III), (C6F5)I(O2CCF3)2, has been determined. Crystals are triclinic, of space group [Formula: see text], witsh a = 5.732(2) Å, b = 12.127(4) Å, c = 29.658(9) Å, α = 116.53(2)°, β = 98.02(2)°, γ = 117.09(2)°, V = 1482.0(8) Å3, Dc = 2.33 g cm−3 for Z = 4, and R1 = 0.0420 (R2 = 0.0431) for 2722 reflections with I > 3σ(I). The two independent molecules in the asymmetric unit have essentially the same primary geometry about the central iodine, a distorted T-shaped AX3E2 arrangement. Keywords: 127I Mössbauer, aryliodine(III) carboxylates, crystal structure, (C6F5)I(O2CCF3)2.

scholarly journals Darstellung und Kristallstruktur von Erdalkalidicyanoargentaten M[Ag(CN)2]2 • 2 H2O (M = Ca, Sr) / Properties and Crystal Structure of Alkaline-Earth Dicyanoargentates M[Ag(CN)2]2 • 2 H2O (M = Ca, Sr)

1985 ◽  
Vol 40 (12) ◽  
pp. 1618-1621 ◽  
Keyword(s):  
Crystal Structure ◽  
Alkaline Earth ◽  
Structural Model ◽  
Direct Methods ◽  
Trigonal Prism ◽  
Water Molecules ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Tricapped Trigonal Prism ◽  
Fractionated Crystallization

Abstract Alkaline-earth dicyanoargentates M[Ag(CN)2]2 • 2H2O (M = Ca. Sr) were synthesized by reaction of M(ClO4)2 with K[Ag(CN)2] and subsequent fractionated crystallization. The colourless, light-sensitive crystals are orthorhombic, space group Pbcm, with a = 8.435(1) Å, b - 6.3985(6) Å , c = 18.584(2) Å , Z = 4 (M = Ca), and a = 8.0032(8) Å, b = 6.8688(5) Å, c = 18.870(1) Å , Z = 4 (M = Sr). A structural model derived from Direct Methods was refined to R = 0.064 and R = 0.044. rsp. The structure of the two isotypic compounds comprises layers of [Ag(CN)2]“ dumb-bells, arranged in such a way, that trigonal prisms of nitrogen are formed. These prisms are occupied by the alkaline-earth ions. Three oxygen atoms from neighbouring water molecules complete a tricapped trigonal prism around Ca2+ and Sr2+

Darstellung und Kristallstruktur von Rubidiumdicyanoargentat (I), Rb[Ag(CN)2] · 0,4H2O / Synthesis Crystal Structure of Rubidium Dicyanoargentate (I), Rb[Ag(CN)2] · 0,4H2O

1993 ◽  
Vol 48 (2) ◽  
pp. 133-139
Author(s):  
Sabine Kühnei ◽  
Klaus-Jürgen Range
Keyword(s):  
Crystal Structure ◽  
Direct Methods ◽  
Water Molecules ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Silver Cyanide ◽  
Trigonal Prismatic ◽  
Silver Atoms

AbstractRb[Ag(CN)2] · 0,4H2O was synthesized by reaction of silver cyanide with RbOH and liquid HCN at 0 °C. The colourless crystals are orthorhombic, space group Cmc21, with a = 14.440(3), b = 17.645(1), c = 14.799(1) Å and Z = 32. The structure was solved by Patterson and standard direct methods and refined to R = 0.060 and Rw = 0.051, respectively, for 2204 absorption-corrected unique reflections with F > σ(F). The structure comprises slightly buckled layers of linear [Ag(CN)2]- groups, in which silver atoms are arranged in three- and eight-membered rings. The shortest Ag -Ag distance is 3.05 Å. The rubidium ions are arranged in trigonal-prismatic, cubic and square-antiprismatic sites. Additional cavities contain the water molecules.

Donor Atom Set and Spin State of Iron(II). Bis(ligand)iron(II) and Bis(ligand)nickel(II) Complexes of 2,2′-Bipyridine-6-carbothioamide and 2,2′-Bipyridine-6-carboxamide

1998 ◽  
Vol 51 (4) ◽  
pp. 273 ◽  
Author(s):  
Bradley J. Childs ◽  
John M. Cadogan ◽  
Donald C. Craig ◽  
Marcia L. Scudder ◽  
Harold A. Goodwin
Keyword(s):  
Ground State ◽  
Mössbauer Spectra ◽  
Monoclinic Space Group ◽  
Singlet Ground State ◽  
Orthorhombic Space Group ◽  
Triclinic Space Group ◽  
Space Group ◽  
Mossbauer Spectra ◽  
Infrared Spectral

2,2′-Bipyridine-6-carbothioamide (bpytm) and 2,2′-bipyridine-6-carboxamide (bpyam) are NNS and NNO donors, respectively, in their cationic bis(ligand)iron(II) and bis(ligand)nickel(II) complexes. The former ligand provides the stronger field and salts of [Fe(bpytm)2]2+ have a singlet ground state, while those of [Fe(bpyam)2]2+ have a quintet ground state. The magnetism and the electronic and Mössbauer spectra of salts of these cations have been measured. The low-temperature Mössbauer spectra of iron(II) complex salts of the carboxamide indicate, for the perchlorate and triflate salts, but not for the fluoroborate salt, a partial transition to singlet-state species. The mode of coordination of the ligands is indicated by infrared spectral data and has been confirmed by determination of the structures of [Ni(bpytm)2] Cl2.4H2O, [Ni(bpyam)2] [BF4]2.H2O and [Fe(bpyam)2] [BF4]2. In addition, the structures of the free ligands have been determined. Hydrogen bonding is present in the free ligands and their complexes. 2,2′-Bipyridine-6-carbothioamide: monoclinic, space group P21/c, a 8·265(3), b 11·175(2), c 11·114(4) Å, β 94·47(2)°, Z 4. 2,2′-Bipyridine-6-carboxamide: monoclinic, space group P21/c, a 13·581(2), b 9·926(1), c 16·824(3) Å, β 116·481(7)°, Z 8. [Ni(bpytm)2] Cl2.4H2O: triclinic, space group P-1, a 9·291(5), b 12·426(7), c 13·425(7) Å, α 113·54(3), β 95·63(3), γ 94·43(3)°, Z 2. [Ni(bpyam)2][BF4]2.H2O: triclinic, space group P-1, a 10·663(5), b 10·861(6), c 12·799(6) Å, α 68·70(4), β 77·84(4), γ 78·47(4)°, Z 2. [Fe(bpyam)2] [BF4]2: orthorhombic, space group P bcn, a 12¡317(6), B 12¡609(4), c 16·644(8) Å, Z 4.

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