Notizen: Ca{Li2[Mn'N]2}: Kristallchemischer Brückenschlag Zwischen Lithium-Nitrido-Verbindungen und Borid-Carbiden des Typs M [B2C2]/ Ca{Li2[M nIN]2}: Link between Crystal Chemistry of Lithium Nitrido Compounds and Boride Carbides of the Type M [B2C2]

2000 ◽  
Vol 55 (10) ◽  
pp. 988-991 ◽  
Author(s):  
Jens Klatyk ◽  
Rainer Niewa ◽  
Rüdiger Kniep
Keyword(s):  
Crystal Structure ◽  
Crystal Chemistry ◽  
Stacking Sequence ◽  
Space Group ◽  
Linear Chains ◽  
Infinite Linear

AbstractThe nitridom anganate(I) Ca{Li2[MnIN]2) (space group P4/mbm: a = 703.35(7), c = 383.19(6) pm; Z = 2) contains infinite linear chains 1∞=[MnIN2/22-] running along the [001] direction. The nitride species of the chains are further linked via three coordinated lithium to form planar 4.82-nets 2∞{Li2N24-} parallel (001). Ca2+ occupies the centers of the eight-membered rings of the planar nets. The 4.82-arrangement 2∞{Li2N24-} together with the stacking sequence ...AA... along [001] exhibit strong topological similarities with the anionic substructure 2∞[B2C22-] observed in the crystal structure of e.g. Ce[B2C2]

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.

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.

Holtite, (Si2.25Sb0.75)B [Al6(Al0.43Ta0.27□0.30) O15 (O,OH)2.25]: crystal structure and crystal chemistry

1989 ◽  
Vol 53 (372) ◽  
pp. 457-463 ◽  
Author(s):  
B. F. Hoskins ◽  
W. G. Mumme ◽  
M. W. Pryce
Keyword(s):  
Crystal Structure ◽  
Least Squares ◽  
Crystal Chemistry ◽  
Octahedral Site ◽  
Full Matrix ◽  
Space Group ◽  
Metal Site ◽  
The Difference

AbstractHoltite, (Si2.25Sb0.75)B[Al6(Al0.43Ta0.27□0.30)O15(O,OH)2.25], is orthorhombic a = 4.6914(5), b = 11.896(2), c = 20.383(4)Å, space group Pnma. Full-matrix least-squares refinement yielded a final R = 0.030, for 1664 reflections with I ⩾ 3σ(I). Its crystal structure is closely related to that of dumortierite, but with the difference that extensive substitution of Si by Sb occurs in holtite. SbO3 triangular pyramids replace the SiO4 tetrahedra arranged around the inside edge of the hexagonally shaped tunnels which are the feature of the dumortierite and holtite structures. Associated with these replacements is the replacement of Al by Ta in the octahedral site centred in these tunnels, and the development of vacancies in this metal site and its attached oxygens.

scholarly journals Crystal structure of Cr-bearing Mg3BeAl8O16, a new polytype of magnesiotaaffeite-2N′2S

2016 ◽  
Vol 72 (7) ◽  
pp. 1060-1063
Author(s):  
Thomas Malcherek ◽  
Jochen Schlüter
Keyword(s):  
Crystal Structure ◽  
Group Symmetry ◽  
Stacking Sequence ◽  
Space Group Symmetry ◽  
Space Group ◽  
Mineral Sample

The crystal structure of a new polytype of magnesiotaaffeite-2N′2S, ideally Mg3BeAl8O16(trimagnesium beryllium octaaluminium hexadecaoxide), is described in space-group symmetryP-3m1. It has been identified in a fragment of a mineral sample from Burma (Myanmar). The new polytype is composed of two Mg2Al4O8(S)- and two BeMgAl4O8(N′)-modules in a stacking sequenceN′SSN′′ which differs from theN′SN′S-stacking sequence of the known magnesiotaaffeite-2N′2Spolytype. The crystal structure can be derived from a close-packed arrangement of O atoms and is discussed with regard to its polytypism and its Cr3+chromophore content.

scholarly journals Lead-antimony sulfosalts from Tuscany (Italy). XIX. Crystal chemistry of chovanite from two new occurrences in the Apuan Alps and its 8 Å crystal structure

2017 ◽  
Vol 81 (4) ◽  
pp. 811-831 ◽  
Author(s):  
Cristian Biagioni ◽  
Yves Moëlo
Keyword(s):  
Crystal Structure ◽  
Oxygen Atom ◽  
Crystal Chemistry ◽  
Electron Microprobe ◽  
Unit Cell ◽  
Unit Cell Parameters ◽  
Space Group ◽  
Cell Parameters ◽  
New Occurrences ◽  
Apuan Alps

AbstractTwo new occurrences of the lead oxy-sulfosalt chovanite have been identified at the Monte Arsiccio and Pollone mines, Apuan Alps, Tuscany, Italy. Chovanite from Monte Arsiccio occurs as black acicular crystals, up to 5 mm long, associated with rouxelite, robinsonite, sphalerite, valentinite,baryte, dolomite, quartz and Ba-rich K-feldspar ('hyalophane') in metadolostone vugs. Its unit-cell parameters are a = 48.38(5), b = 4.11(4), c = 34.18(4) Å, β = 106.26(2)°, V = 6521(64) Å3, space group C2/m. Very weakreflections indicate the doubling of the b parameter. Electron-microprobe data gave (wt.%): Ag 0.28, Tl 1.51, Pb 45.57, Sb 31.00, As 1.09, S 19.73, Se 0.05, Cl 0.02, sum 99.25. On the basis of ∑Me = 58 apfu, its formula is Ag0.30Tl0.86Pb25.56Sb29.59As1.69S71.52Se0.07Cl0.05.Adding one oxygen atom, it is close to the formula TlPb26(Sb,As)31S72O. Chovanite from Pollone occurs as thick black acicular crystals, up to 1 cm long, associated with baryte and quartz. The high-diffraction quality of the available material allowed the solutionand refinement of the 8 Å crystal structure in the space group P21/c, with unit-cell parameters a = 34.052(3), b = 8.2027(7), c = 48.078(4) Å, β = 106.258(4)°, V = 12891.9(19) Å3. The refinement convergedto R1 = 9.14% on the basis of 19,853 observed reflections with Fo > 4σ(Fo). Electron-microprobe data gave (wt.%): Ag 0.12, Tl 0.54, Pb 48.34, Bi 0.20, Sb 26.71, As 3.37, S 20.23, Cl 0.07, sum 99.57. It corresponds to the formulaAg0.13Tl0.30Pb26.94Bi0.10Sb25.33As5.20S72.85Cl0.20, close to the idealized formula Pb28(Sb,As)30S72O, with a single oxygen atom bound to two (Sb/As) atoms alternating witha vacancy along b as in scainiite and in other Pb oxy-sulfosalts. The crystal chemistry of this 8 Å crystal structure is detailed, taking into account its modular description, the (Sb,As)mSn polymerization, its topological derivation from pellouxite,and the oxygen non-stoichiometry.

scholarly journals Notiz zur Kristallchemie von LiBa2Cu3O6 / Note on the Crystal Chemistry of LiBa2Cu3O6

1995 ◽  
Vol 50 (4) ◽  
pp. 681-683 ◽  
Author(s):  
G. Tams ◽  
Hk. Müller-Buschbaum ◽  
Ch. Lang
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Crystal Chemistry ◽  
Laser Heating ◽  
Space Group ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of LiBa2Cu3O6 have been prepared by recrystallization from melts in a stream of dry Argon as well as by spontaneous CO2- LASER heating. It crystallizes with orthorhom bic symmetry, space group D232h - Fmmm, a = 8,219(2), b = 11,520 (2), c = 14,284(3) Å, Z = 8. The crystal structure is isotypic to NaBa2Cu3O6.

Zur Kristallchemie der Oxoplatinate. Eine neue Phase der Zusammensetzung Sr4-ϰNaϰPtO6 (ϰ = 0,33) / On the Crystal Chemistry of Oxoplatinates. A New Phase of the Composition Sr4-ϰNaϰPtO6 (ϰ = 0,33)

1994 ◽  
Vol 49 (5) ◽  
pp. 581-584 ◽  
Author(s):  
G. Tams ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Crystals ◽  
Crystal Chemistry ◽  
Space Group ◽  
X Ray ◽  
Group D ◽  
Related Compounds ◽  
New Phase ◽  
Trigonal Prismatic

Single crystals of Sr3.67Na0.33PtO6 were prepared by heating oxide mixtures in closed silver tubes and investigated by X-ray single crystal techniques. It crystallizes with trigonal symme­try, space group D63d-R3̅c (Nr. 167) with a = 9.6617, c = 11.6580 Å, Z = 6. Sr3.67Na0.33PtO6 belongs to the Sr4PtO6 type and is isotypic to K4CdCl6. One point position characterized by a trigonal prismatic O2- coordination is occupied by Na+ and Sr2+ statistically. The crystal structure is discussed with respect to the related compounds Sr3CuPtO6 and Ca3. 5Cu0.5PtO6.

The crystal structure of averievite, Cu5O2(VO4)2.nMX: comparison with related compounds

1997 ◽  
Vol 61 (406) ◽  
pp. 441-446 ◽  
Author(s):  
G. L. Starova ◽  
S. V. Krivovlchev ◽  
V. S. Fundamensky ◽  
S. K. Filatov
Keyword(s):  
Crystal Structure ◽  
Crystal Chemistry ◽  
Point Of View ◽  
Space Group ◽  
Atomic Arrangement ◽  
Trigonal System ◽  
Related Compounds

AbstractThe crystal structure of averievite, Cu5O2(VO4)2·nMX has been determined. Trigonal system, space group P3, a = 6.375(1), c = 8.399(1) Å, V = 295.6(1) Å3, Z = 1, Dx = 4.01(1) g/cm3. The atomic arrangement is characterized by infinite nets parallel to (001) composed of [OCu4]6+ tetrahedra linked via corners in hexagonal rings. The bases of neigbouring tetrahedra are in one plane and their non-shared corners are turned to the opposite sides. The [VO4]3− tetrahedra are attached to the bases of [OCu4] tetrahedra. There are large (R >3.2 Å) channels in the structure where large molecular particles can enter. The comparison of the averievite structure with related compounds (in particular, copper oxovanadates) is given from the point of view of [OT4] polyion crystal chemistry.

Zwei Beispiele fiir partielle und totale Defekte im Ba▪Ln2Mo4O16-Typ: BaCu0,41▪0,59Pr2Mo4O16 und Ba▪Yb2Mo4O16 / Two Examples of Partial and Total Defects in the Ba▪Ln2Mo4O16-Typ: BaCu0,41▪0,59Pr2Mo4O16 and Ba▪Yb2Mo4O16

1996 ◽  
Vol 51 (1) ◽  
pp. 85-89 ◽  
Author(s):  
St. Gallinat ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Crystal Chemistry ◽  
Reference Compound ◽  
Monoclinic Symmetry ◽  
Space Group ◽  
First Case ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of (I) BaCu0,41Pr2Mo4O16 and (II) BaYb2Mo4O16 have been prepared by flux technique. Both compounds crystallize with monoclinic symmetry, space group C62h-C2/c with (I): a = 5.352(11), b = 12.888(2), c = 19.399(4) Å; β = 90.89(3)°; (II): a = 5.181(7), b = 12.467(3), c -19.350(3) Å , β -91.93(2)°, Z = 4. The crystal structure is characterized by 1∞[BaMO12]-chains along [010]. In the first case the M positions are occupied by copper by about 41%, in the second case these positions remain completely unoccupied. With respect to the crystal chemistry of the reference compound Ba(Cu0.22Mg0,78)Nd2Mo4O16 all substances of the composition BaLn2Mo4O16 should be written as Ba▪Ln2Mo4O16 indicating the holes in the 1∞[BaMO12]-chains by ▪.

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.

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