scholarly journals Darstellung und Kristallstrukturen von (PH4P)4Sb8I28 und (Ph4P)Sb3I10(Ph = C6H5) / Synthesis and Crystal Structures of (PH4P)4Sb8I28 and (Ph4P)Sb3I10(Ph = C6H5)

1987 ◽  
Vol 42 (12) ◽  
pp. 1493-1499 ◽  
Author(s):  
Siegfried Pohl ◽  
Wolfgang Saak ◽  
Detlev Haase
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Diffraction Data ◽  
Lone Pair ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
X Ray ◽  
Molar Ratios ◽  
Polymeric Chains ◽  
Bond Strengths

AbstractThe compounds (Pn4P)4Sb8I28 (1) and (Ph4P)Sb3I10 (2) were prepared by the reaction of SbI3 and Ph4PI in acetonitrile (molar ratios 2:1 and 3:1 respectively). The structures of 1 and 2 were determined from single crystal X-ray diffraction data.1 crystallizes in the triclinic space group P1̄ with a - 1321.7(5). b = 1346.7(5), c = 2201.8(8) pm, α = 104.18(2). β = 99.92(2), γ = 100.33(2)°; 2: monoclinic, C2/c, a = 2371.1(2), b = 745.0(1), c = 2495.1(2) pm, β = 100.75(1)°.Whereas 1 exhibits isolated Sb8I284- ions, the anions of 2 are built up of polymeric chains [Sb3I10- ]∞. In both compounds the distorted Sbl6 octahedra are linked by common edges. The Sb-I distances are in the range between 277.4 and 354.8 pm (1) and between 277.4 and 342.4 pm (2). The observed structures do not only depend on stoichiometry, the nature of the counter cations, and the possibility of oligomerisation but also on the wide variety of the Sb-I bond strengths and the different bridges formed by iodine.The lone pair of Sb(III) seems to be predominantly 5 s2.

Synthesis and structure of M 0.5Bi3P2O10 (M = Ca, Sr, Ba, Pb) series

2003 ◽  
Vol 59 (5) ◽  
pp. 606-610 ◽  
Author(s):  
Digamber G. Porob ◽  
T. N. Guru Row
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Diffraction Data ◽  
Ternary Systems ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
Ceramic Method ◽  
Space Group ◽  
X Ray

A series of M 0.5Bi3P2O10 compounds with M = Ca, Sr, Ba and Pb have been synthesized in MO–Bi2O3–P2O5 ternary systems by the ceramic method and the crystal structures were then solved using single-crystal X-ray diffraction data. These compounds are isostructural with Bi6.67P4O20 (triclinic, space group P\bar 1, Z = 2). The structures consist of infinite chains of Bi2O2 units along the c axis formed by linking BiO8 and BiO6 polyhedra. These chains are interconnected by MO8 polyhedra forming two-dimensional layers in the ac plane. The phosphate tetrahedra are sandwiched between these layers.

Darstellung, Reaktionen und Kristallstrukturen von (Me3NCH2Ph)2 Fe2I6 und Fe2I4(SPPh3)2 · PhMe (Ph = C6H5, Me = CH3) / Preparation, Reactions, and Crystal Structure of (Me3NCH2Ph)2Fe2I6 and Fe2I4(SPPh3)2 · PhMe (Ph = C6H5, Me = CH3)

1988 ◽  
Vol 43 (3) ◽  
pp. 289-294 ◽  
Author(s):  
Wolfgang Saak ◽  
Detlev Haase ◽  
Siegfried Pohl
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Diffraction Data ◽  
Monoclinic Space Group ◽  
Donor Atom ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
Space Group ◽  
X Ray ◽  
Molar Ratios

The reaction of FeI2, with (Me3NCH2Ph)I in CH2Cl2 and with Ph3PS in toluene (molar ratios 1:1) yields (Me3NCH2Ph)2Fe2I6 (1) and Fe2I6(SPPh3)2·C6H5CH3 (2), respectively. The structures of 1 and 2 were determined from single crystal X-ray diffraction data. 1 crystallizes in the monoclinic space group P21/n with a = 895.7(2), b = 1400.5(2), c = 1360.6(3) pm. β = 95.82(2)°, Z = 2. The anion of 1, Fe2I62-, has edge-sharing double-tetrahedra. The bridging and terminal F e - I bond lengths were found to be 269.9/270.7 and 260.3/258.6 pm, respectively (Fe-Fe: 358.2 pm). 2 crystallizes in the triclinic space group P1̄ with a = 987.6(1), b = 1119.3(1), c = 1159.4(1) pm, α = 101.10(1), β = 99.15(1), γ = 102.83(1)°, Z = 1. The molecules of 2 consist of centrosymmetric dinuclear Fe2I2 units (like for Fe2I62- in 1), with F e - I distances of 266.4 and 273.4 pm. The distorted tetrahedra around Fe are completed by an iodide ion (Fe-I: 256.9 pm) and Ph3PS with the sulfur as donor atom. The Fe-Fe distance was found to be 339.7 pm.

On racemic and L-malates: a comparison of their crystal structures

2004 ◽  
Vol 219 (2) ◽  
Author(s):  
Michel Fleck ◽  
Ekkehart Tillmanns ◽  
Ladislav Bohatý ◽  
Peter Held
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Monoclinic Space Group ◽  
Powder Diffraction Data ◽  
X Ray Diffraction ◽  
Powder Diffraction File ◽  
Space Group ◽  
X Ray

AbstractThe crystal structures of eight different L-malates have been determined and refined from single-crystal X-ray diffraction data. The compounds are the monoclinic (space groupIn addition, for all the compounds, powder diffraction data were collected, analysed and submitted to the powder diffraction file (PDF).

scholarly journals Hydrogels formed from Fmoc amino acids

CrystEngComm ◽  
2015 ◽  
Vol 17 (42) ◽  
pp. 8047-8057 ◽  
Author(s):  
Emily R. Draper ◽  
Kyle L. Morris ◽  
Marc A. Little ◽  
Jaclyn Raeburn ◽  
Catherine Colquhoun ◽  
...  
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
Single Crystal ◽  
Crystal Structures ◽  
Diffraction Data ◽  
Low Molecular Weight ◽  
X Ray Diffraction ◽  
X Ray ◽  
Single Crystal Structures

A number of Fmoc amino acids can be effective low molecular weight hydrogelators; we compare single crystal structures to fibre X-ray diffraction data.

(Ph4P)2 Mn2Br6 und (Ph3PCH2Ph)2Mn2I6 (Ph = C6H5) / (Ph4P)2Mn2Br6 and (Ph 3PCH2Ph)2Mn2I6 (Ph = C6H5

1988 ◽  
Vol 43 (2) ◽  
pp. 171-174 ◽  
Author(s):  
Siegfried Pohl ◽  
Wolfgang Saak ◽  
Peter Stolz
Keyword(s):  
Single Crystal ◽  
Diffraction Data ◽  
Unit Cell ◽  
Formula Unit ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
X Ray ◽  
Bond Lengths ◽  
The Mean ◽  
The Difference

(Ph4P)2Mn2Br6 (1) and (Ph3PCH2Ph)2Mn2I6 (2) were prepared from the reaction of manganese dihalide with the corresponding phosphonium halide in CH2Cl2.The structures of 1 and 2 were determined from single crystal X-ray diffraction data.Both compounds crystallize in the triclinic space group P 1 with one formula unit per unit cell.1:a = 998.1(1), b = 1005.7(1), c = 1313.3(2) pm, α = 108.51(1), β = 94.25(1), γ = 100.36(1)°.2: a = 1058.6(2), b = 1236.3(2), c = 1248.4(3) pm, α = 63.53(1), β = 74.15(1), γ = 74.65(1)°.The structures of 1 and 2 exhibit discrete, dimeric anions formed by the fusion of two identical tetrahedral-like units with a common halogen-halogen edge. The mean Mn-Hal bond lengths were found to be 251.8 pm (Mn-Br) and 272.2 pm (Mn-I). The difference between the bridging and terminal Mn-Hal bond lengths is about 12-13 pm in both compounds

High-pressure syntheses and crystal structures of orthorhombic DyGaO3 and trigonal GaBO3

2015 ◽  
Vol 70 (4) ◽  
pp. 207-214 ◽  
Author(s):  
Daniela Vitzthum ◽  
Stefanie A. Hering ◽  
Lukas Perfler ◽  
Hubert Huppertz
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Single Crystal ◽  
Crystal Structures ◽  
Diffraction Data ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
High Pressure High Temperature

AbstractOrthorhombic dysprosium orthogallate DyGaO3 and trigonal gallium orthoborate GaBO3 were synthesized in a Walker-type multianvil apparatus under high-pressure/high-temperature conditions of 8.5 GPa/1350 °C and 8 GPa/700 °C, respectively. Both crystal structures could be determined by single-crystal X-ray diffraction data collected at room temperature. The orthorhombic dysprosium orthogallate crystallizes in the space group Pnma (Z = 4) with the parameters a = 552.6(2), b = 754.5(2), c = 527.7(2) pm, V = 0.22002(8) nm3, R1 = 0.0309, and wR2 = 0.0662 (all data) and the trigonal compound GaBO3 in the space group R3̅c (Z = 6) with the parameters a = 457.10(6), c = 1419.2(3) pm, V = 0.25681(7) nm3, R1 = 0.0147, and wR2 = 0.0356 (all data).

Solvothermal Syntheses and Crystal Structures of New One-dimensional Selenogallates [bappH2][Ga2Se4] (bapp = 1,4-Bis-(3-aminopropyl)piperazine) and [Mn(en)3][Ga2Se5] (en = Ethylenediamine)

2011 ◽  
Vol 66 (9) ◽  
pp. 877-881
Author(s):  
Chao Xu ◽  
Jing-Jing Zhang ◽  
Taike Duan ◽  
Qun Chen ◽  
Qian-Feng Zhang
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Solvothermal Syntheses ◽  
Polymeric Chains ◽  
Amine Complex ◽  
Solvothermal Conditions ◽  
Metal Amine

Two new selenogallates, [bappH2][Ga2Se4] (1) (bapp = 1,4-bis(3-aminopropyl)-piperazine) and [Mn(en)3][Ga2Se5] (2) (en = ethylenediamine), have been synthesized under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction. Compounds 1 and 2 contain one-dimensional polymeric chains {[Ga2Se4]2−}∞ and {[Ga2Se5]2−}∞, respectively. The negative charges of the polymeric chains are balanced by a protonated 1,4-bis(3-aminopropyl)piperazine cation in 1 and by the metal-amine complex cations [Mn(en)3]2+ in 2. TGA analyses have shown that compound 2 is thermally more stable than compound 1.

Structural Study of the Disordered RECd6 Quasicrystal Approximants (RE = Tb, Ho, Er, Tm and Lu)

2006 ◽  
Vol 61 (6) ◽  
pp. 644-649 ◽  
Author(s):  
Shu Ying Piao ◽  
Cesar P. Gömez ◽  
Sven Lidin
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Structural Study ◽  
Diffraction Data ◽  
Unit Cell Dimension ◽  
Unit Cell ◽  
Cell Dimension ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Types

The crystal structures of approximants RECd6 (RE = Tb, Ho, Er, Tm and Lu) have been refined from single crystal X-ray diffraction data. This work is a continuation of a previous study of MCd6 approximants [1] in which the different types of disorder of the central Cd4 tetrahedra located in the dodecahedral cavities were examined. The structures of the title compounds are all similar to GdCd6 and disorder was observed in all these compounds. There is a correlation between the anisotropic displacement parameter and the unit cell dimension

Crystal structures of (RS)-Di-μ-chloro-tetrakis(ethane-1,2-diamine)nickel(II) dichloride and diperchlorate

1978 ◽  
Vol 31 (2) ◽  
pp. 285 ◽  
Author(s):  
GA Bottomley ◽  
LG Glossop ◽  
CL Raston ◽  
AH White ◽  
AC Willis
Keyword(s):  
Single Crystal ◽  
Least Squares ◽  
Crystal Structures ◽  
Diffraction Data ◽  
Complex Cation ◽  
Dimeric Complex ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coordination Sites

The crystal structures of [(en)2NiCl2Ni(en)2] Cl2 (1) and [(en)2NiCl2Ni(en)2] (ClO4)2 (2) have been redetermined from single- crystal X-ray diffraction data at 295(1) K and refined by least squares to residuals of 0.073 and 0.052 respectively for 1345 and 1605 'observed' reflections respectively. Crystals of (1) are monoclinic, P21/n, a 14.053(4), b 11.309(3), c 6.326(1) Ǻ, β 94.22(2)�, Z 2. Crystals of (2) are monoclinic, P21/n, a 8.885(12), 6 19.707(20), c 7.120(8) Ǻ, β 108.99(4)�, Z 2. In both (1) and (2), a dimeric complex cation is observed, a pair of cis coordination sites about the nickel in each case being occupied by the bridging chlorines; the latter are asymmetric (Ni-Cl, 2.461(3), 2.551(3)(1); 2.461(3), 2.512(3) Ǻ (2)).

scholarly journals High-Pressure Syntheses, Crystal Structures, And Thermal Behaviour Of β-Re(Bo2)3 (Re = Nd, Sm, Gd)

2007 ◽  
Vol 62 (6) ◽  
pp. 765-770 ◽  
Author(s):  
Holger Emme ◽  
Gunter Heymann ◽  
Almut Haberer ◽  
Hubert Huppertz
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Single Crystal ◽  
Crystal Structures ◽  
Thermal Behaviour ◽  
Diffraction Data ◽  
Ambient Pressure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Conditions

The compounds β -RE(BO2)3 [RE = Nd (neodymium meta-borate), Sm (samarium meta-borate) and Gd (gadolinium meta-borate)] were synthesized under high-pressure and high-temperature conditions in a Walker-type multianvil apparatus at 3.5 GPa (Nd), 7.5 GPa (Sm, Gd) and 1050 °C. The crystal structures were determined by single crystal X-ray diffraction data collected at r. t. (Sm, Gd) and at−73°C (Nd), respectively. The structures are isotypic with the already known ambient-pressure phases β -RE(BO2)3 (RE = (Tb, Dy) and the high-pressure phases β -RE(BO2)3 (RE = Ho-Lu)

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