The Constituents of Marine Sponges. V. The Isolation From Chelonaplysilla violacea (Dendroceratida) of Aplyviolene and Other Diterpenes, and the Determination of the Crystal Structure of Aplyviolene

1990 ◽  
Vol 43 (11) ◽  
pp. 1861 ◽  
Author(s):  
TW Hambley ◽  
A Poiner ◽  
WC Taylor
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Marine Sponge ◽  
Marine Sponges ◽  
Spectroscopic Methods ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Deep Violet

From the deep violet, encrusting marine sponge Chelonaplysilla violacea, two rearranged spongian diterpenes, aplyviolene, (1R*,1′S*,3?aR*,5R*,6R*,8R*,8′aS*)-3-oxo-8-(1′,4′,4′-trimethyl-8′-methylenedecahydroazulen-1′-yl)-2,7-dioxabicyclo[3.2.1]oct-6-yl acetate (1), the acetoxy derivative, aplyviolacene (2), (5R*,8S*,9S*,10R*,13S*,14R* ,15S*,16R*)-spongian-15,16-diyl diacetate (3) and (5R*,8S*,9S*,10R*,13S*,14R*)-spongian-16-one (4) were isolated. The structures were determined by spectroscopic methods, and the structure of aplyviolene was confirmed by a single-crystal X-ray determination. The crystal structure was refined to a residual of 0.036 for 1125 independent observed reflections. The crystals were orthorhombic, space group P212121 with a 8.098(1), b 11.628(1), c 21.774(3)Ǻ.

Two lithium tricyanomethanide compounds: syntheses and single-crystal structure determination of LiK[C(CN)3]2 and Li[C(CN)3]·½ (H3C)2CO

2015 ◽  
Vol 70 (3) ◽  
pp. 191-196 ◽  
Author(s):  
Olaf Reckeweg ◽  
Francis J. DiSalvo
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Crystals ◽  
Structure Determination ◽  
Monoclinic Space Group ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Cell Parameters ◽  
New Compounds

AbstractThe new compounds LiK[C(CN)3]2 and Li[C(CN)3]·½ (H3C)2CO were synthesized and their crystal structures were determined. Li[C(CN)3]·½ (H3C)2CO crystallizes in the orthorhombic space group Ima2 (no. 46) with the cell parameters a=794.97(14), b=1165.1(2) and c=1485.4(3) pm, while LiK[C(CN)3]2 adopts the monoclinic space group P21/c (no. 14) with the cell parameters a=1265.7(2), b=1068.0(2) and c=778.36(12) pm and the angle β=95.775(7)°. Single crystals of K[C(CN)3] were also acquired, and the crystal structure was refined more precisely than before corroborating earlier results.

scholarly journals β-Y(BO2)3 – a new member of the β-Ln(BO2)3 (Ln=Nd, Sm, Gd–Lu) structure family

2017 ◽  
Vol 72 (12) ◽  
pp. 983-988 ◽  
Author(s):  
Martin K. Schmitt ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Lattice Parameters ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray

Abstractβ-Y(BO2)3 was synthesized in a Walker-type multianvil module at 5.9 GPa/1000°C. The crystal structure has been elucidated through single-crystal X-ray diffraction. β-Y(BO2)3 crystallizes in the orthorhombic space group Pnma (no. 62) with the lattice parameters a=15.886(2), b=7.3860(6), and c=12.2119(9) Å. Its crystal structure will be discussed in the context of the isotypic lanthanide borates β-Ln(BO2)3 (Ln=Nd, Sm, Gd–Lu).

Notizen: Die Kristallstruktur von Rb2Ca(N3)4 · 4 H2O / The Crystal Structure of RB2Ca(N3)4 · 4 H2O

1988 ◽  
Vol 43 (4) ◽  
pp. 497-498
Author(s):  
Franz A. Mautner ◽  
Harald Krischner ◽  
Christoph Kratky
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Ray Methods

Abstract The crystal structure of Rb2Ca(N3)4 · 4H2O has been determined by single crystal X-ray methods. The compound is isotypic with K2Ca(N3)4 · 4 H2O and crystallizes in the orthorhombic space group Ccca, Z = 4, a = 1949.1(12) pm, b = 1099.5(3) pm, c - 622.2(1) pm.

Kristallstruktur von Cs2[B6H5(SCN)]/ Crystal Structure of Cs2[B6H5(SCN)]

1998 ◽  
Vol 53 (8) ◽  
pp. 816-818 ◽  
Author(s):  
W. Preetz ◽  
S. Zander ◽  
C. Bruhn
Keyword(s):  
Crystal Structure ◽  
Ion Exchange ◽  
Structure Determination ◽  
Deae Cellulose ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray

Abstract By reaction of [B6H6]2-with (SCN)2 in dichloromethane at -80 C° the thiocyanatohexaborate anion is formed and can be isolated by ion exchange chromatography on diethylaminoethyl (DEAE) cellulose. The X-ray structure determination of Cs2[B6H5(SCN)] (orthorhombic, space group Pbca with a = 9.506(5), b = 10.644(5), c = 21.857(5) Å, Z = 8) reveals that the SCN substituent is bonded via the S atom with the B-S distance of 1.885(9) Å and the B-S-C angle of 99.8(5)°. The SCN group is nearly linear (179.9(9)°).

Cis-2-telluro-1.3.2λ5.4λ3-diazadiphosphetidin - Kristallstruktur eines in Lösung fluktuierenden Redoxsystems / Cis-2-telhirium-1.3.2λ5.4λ3-diazadiphosphetidine - Crystal Structure of a Redox System Fluctuating in Solution

1978 ◽  
Vol 33 (6) ◽  
pp. 610-613 ◽  
Author(s):  
Siegfried Pohl
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Bond Length ◽  
Title Compound ◽  
Redox System ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Bond Lengths ◽  
Nitrogen Ring

Abstract The crystal structure of the title compound was determined from single crystal X-ray data. The compound crystallises in the orthorhombic space group Pnma. In contrast to the solution where fluctuating P-Te bonds have been established by NMR analyses the crystals contain isolated molecules with fixed P-Te bonds (bond length: 235.4 pm). The four-membered phosphorus nitrogen ring exhibits significant deviations from planarity. The P-N bond lengths were found to be 168.3 and 175.0 pm, respectively

scholarly journals Zur Stereochemie des freien Elektronenpaares in AX6E-Systemen, IX+ Statisch verzerrtes Anion in [(CH3)2HN(C6H4)NH(CH3)2]TeCl6 / On the Stereochemistry of the Lone-Pair Electrons in AX6E-Systems, IX+ Statically Distorted Anion in [(CH3)2HN(C6H4)NH(CH3)2]TeCl6

1990 ◽  
Vol 45 (5) ◽  
pp. 573-578 ◽  
Author(s):  
André du Bois ◽  
Walter Abriel
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Single Crystal ◽  
Lone Pair ◽  
Intensity Data ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Lone Pair Electrons ◽  
Symmetry Rules

Using 293 K diffractometer intensity data, the crystal structure of [(CH3)2HN(C6H4)NH(CH3)2]TeCl6 has been determined by single crystal X-ray technique and refined to a final Rw of 0.022. The yellow crystals are orthorhombic, space group Pna 21, with a = 17.565(2), b = 8.4496(6), c = 12.572(1) Å and Z = 4. The TeCl62- anions show a strong statical distortion with Te—Cl distances from min. 2.39 to max. 2.78 A. The symmetry rules for the stereochemistry of the lone pair electrons in AX6E-systems are confirmed. The influence of hydrogen bonding on the type of distortion is also discussed.

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.

Crystal Structure of Dibromo(η4-1,5-cyclooctadiene)palladium(II)

1996 ◽  
Vol 61 (9) ◽  
pp. 1335-1341 ◽  
Author(s):  
Petr Štěpnička ◽  
Ivana Císařová
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Single Crystal ◽  
Boat Conformation ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Square Planar ◽  
Twisted Boat

The crystal structure of [(η4-C8H12)PdBr2] has been determined by a single crystal X-ray diffraction with R = 3.82% for 2 147 independent diffractions. The compound crystallizes with the symmetry of orthorhombic space group P212121 (No. 19) within the following parameters: a = 7.0785(5) Å, b = 11.1896(9) Å, c = 12.514(1) Å, V = 991.2(1) Å3, Z = 4. The square planar arrangement of ligands around Pd(II) is distorted due to the steric requirements of 1,5-cyclooctadiene in a twisted boat conformation. Formula units are joined by the weak C2-H2...Br1(1 + x, y, z) hydrogen bonds.

Na5InTe4 und Na5In2Te6 — Erste Beispiele für Neso-sowie Ditelluro-verbrückte Inotelluroindate/Na5InTe4 and Na5In2Te6 — First Examples of Neso-and Ditelluro-Bridged Inotelluroindates

1990 ◽  
Vol 45 (1) ◽  
pp. 8-14 ◽  
Author(s):  
Brigitte Eisenmann ◽  
Achim Hofmann ◽  
Roland Zagler
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Bond Length ◽  
Single Crystals ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray

Abstract Single crystals of the ternary com pounds Na5InTe4 and Na5In2Te6 have been grown from the melt und have been investigated by X-ray single crystal techniques.Na5InTe4: orthorhombic, space group Pbcn; Z = 8; a = 742.7(4) pm, b = 2015.4(8) pm, c = 1773.3(6) pm; Na5In:Te6: orthorhombic, space group Cmc21; Z = 8; a = 902.1(4) pm, b = 1536.1(5) pm , c = 2356.5(6) pm.The crystal structure of Na5InTe4 contains isolated InTe4 tetrahedra (mean bond length: 278.8 pm). In the crystal structure of Na5In2Te6 InTe4 tetrahedra are connected through common vertices to "Zweiereinfach"-chains. Two neighbouring chains each are joined further to ribbons through Te -Te bridges between every second InTe4 tetrahedron.

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.

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