Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

2,2,6,6-Tetra-kis(biphenyl-2-yl)-4,4,8,8-tetra-methyl-cyclo-tetra-siloxane.

ABSTRACT: The title compound, [-Si(C(12)H(9))(2)OSi(CH(3))(2)O-](2), was obtained unintentionally as the product of an attempted crystallization of caesium bis-(biphenyl-2,2'-di-yl)fluoro-silicate from dimethyl-formamide. In the crystal, the mol-ecule is located on an inversion center and the siloxane ring adopts a twist-chair conformation with the two dimethyl-substituted Si atoms lying 0.7081 (5) Å out of the plane defined by the two bis-(biphenyl-2-yl)-substituted Si atoms and the four O atoms. In each Si(C(12)H(9))(2) unit, the orientation of one terminal phenyl ring relative to the phenyl-ene ring of the other biphenyl moiety suggests a parallel displaced π-π stacking inter-action [centroid distance = 4.2377 (11) Å and dihedral angle = 15.40 (9)°].

SUBMITTER: Couzijn EP

PROVIDER: S-EPMC2969922 | biostudies-literature | 2009 Aug

REPOSITORIES: biostudies-literature

ACCESS DATA

Json Xml

Publications

2,2,6,6-Tetra-kis(biphenyl-2-yl)-4,4,8,8-tetra-methyl-cyclo-tetra-siloxane.

Couzijn Erik P A EP Lutz Martin M Spek Anthony L AL Lammertsma Koop K

Acta crystallographica. Section E, Structure reports online 20090819 Pt 9

The title compound, [-Si(C(12)H(9))(2)OSi(CH(3))(2)O-](2), was obtained unintentionally as the product of an attempted crystallization of caesium bis-(biphenyl-2,2'-di-yl)fluoro-silicate from dimethyl-formamide. In the crystal, the mol-ecule is located on an inversion center and the siloxane ring adopts a twist-chair conformation with the two dimethyl-substituted Si atoms lying 0.7081 (5) Å out of the plane defined by the two bis-(biphenyl-2-yl)-substituted Si atoms and the four O atoms. In each ...[more]

PMID: 21577587

Similar Datasets

1,1-(Biphenyl-2,2'-diyldi-oxy)-3,3,5,5-tetra-kis-(4-bromo-methyl-phen-oxy)cyclo-triphosphazene.

Project description:In the title compound, C(40)H(32)Br(4)N(3)O(6)P(3), the cyclo-triphos-phazene ring adopts a planar conformation, with an r.m.s. deviation of 0.0247 Å. In the crystal, there is a weak inter-molecular C-H⋯O hydrogen bond as well as short inter-molecular Br⋯Br contacts [3.3352 (12) Å].

| S-EPMC3120483 | biostudies-literature

cyclo-Tetra-kis{μ-N'-[(8-oxidoquinolin-7-yl)methyl-idene]isonicotino-hydrazidato}tetra-zinc tetra-hydrate.

Project description:In the title compound, [Zn(4)(C(16)H(10)N(4)O(2))(4)]·4H(2)O, the N'-[(8-oxidoquinolin-7-yl)methyl-idene]isonicotinohydrazidate (L(2-)) ligand binds to the metal ions, forming stable five- and six-membered chelate rings, leaving the pyridyl groups free. The compound is a tetra-nuclear Zn(II) complex centered about a fourfold roto-inversion axis, with the ligand coordinating in the doubly deprotonated form. The Zn(II) atom has a distorted square-pyramidal geometry being coordinated by one N and two O-atom donors from the doubly deprotonated L(2-) ligand, and by one N atom and one O-atom donor from a symmetry-related L(2-) ligand. In the crystal, four symmetry-related lattice water mol-ecules, centred about a fourfold roto-inversion axis, form a cyclic tetra-mer through O-H⋯O hydrogen bonds. These tetra-mers connect to the complex mol-ecules through O-H⋯N hydrogen bonds, forming a chain propagating along [100]. Neighbouring mol-ecules are linked by π-π inter-actions [centroid-centroid distance = 3.660 (2) Å] involving the quinolidine rings.

| S-EPMC3379071 | biostudies-literature

2,9,16,23-Tetra-kis(1-methyl-eth-yl)-5,6,11,12,13,14,19,20,25,26,27,28-dodecadehydro-tetra-benzo[a,e,k,o]cyclo-eicosene.

Project description:The title compound, C(48)H(40), is a tetra-isopropyl-substituted polyannulenoenyne. The unsubstituted polyannulenoenyne, C(36)H(16) (CSD: RICVEE; CAS: 186494-87-1), has quasi-D(2) (222) symmetry, as determined by least-squares fit (excluding H atoms) to a model optimized in D(2) symmetry by mol-ecular mechanics (r.m.s. deviation = 0.239 Å). The least-squares fits of 36 common C atoms of the title compound (at 90 K) to the parent (at 295 K) and to the optimized model show r.m.s. deviations of 0.419 and 0.426 Å, respectively.

| S-EPMC3239117 | biostudies-literature

Tetra-kis(2,3,5,5-tetra-methyl-hexen-2-yl)silane.

Project description:In the title compound, C40H76Si, the Si atom is located on a special position of site symmetry -4. Thus, there is just a quarter of a mol-ecule in the asymmetric unit. The C=C double bonds exhibit a trans configuration. The Si atom and the tert-butyl group are located on the same side of the plane formed by the C=C double bond and its four substituents. The crystal packing shows no short contacts between the mol-ecules and despite the low crystal density (0.980 Mg m(-3)), there are no significant voids in the structure.

| S-EPMC3998395 | biostudies-literature

Tetra-kis(2-amino-4-methyl-pyridinium) cyclo-tetra-μ(2)-oxido-tetra-kis-[dioxido-vanadate(V)] tetra-hydrate.

Project description:The asymmetric unit of the title compound, (C(6)H(9)N(2))(4)[V(4)O(12)]·4H(2)O, contains half of a [V(4)O(12)](4-) anion, two 2-amino-4-methyl-pyridinium, (2a4mpH)(+), cations and two water mol-ecules. One water mol-ecule is disordered over two sets of sites with equal occupancies and the H atoms for this mol-ecule were not included in the refinement. The cation lies on an inversion center with four tetra-hedral VO(4) units each sharing two vertices, forming an eight-membered ring. In the crystal, the components are linked by inter-molecular N-H⋯O hydrogen bonds, forming a one-dimensional network along [100]. Further stabilization is provided by weak inter-molecular C-H⋯O hydrogen bonds. In addition, π-π stacking inter-actions with centroid-centroid distances of 3.5420 (18), 3.7577 (18) and 3.6311 (19) Å are observed.

| S-EPMC3212164 | biostudies-literature

3,5-Dibromo-4-oxo-2,2,6,6-tetra-methyl-piperidin-1-yl oxide.

Project description:In the title compound, C(9)H(14)Br(2)NO(2), the substituted ring exhibits a chair conformation. A crystallographic mirror plane, passing through the N atom, the O atoms and the C atom in the 4-position, bis-ects the mol-ecule.

| S-EPMC3238922 | biostudies-literature

N-(1-Acryloyl-2,2,6,6-tetra-methyl-piperidin-4-yl)acryl-amide.

Project description:The title compound, C(15)H(24)N(2)O(2), crystallizes with two unique mol-ecules, (I) and (II), in the asymmetric unit, differing in the orientation of the acryloyl units with respect to the piperidine rings. The acryl-amide units are essentially planar in both mol-ecules (r.m.s. deviations = 0.042 and 0.024 Å, respectively), as are the C(3)N chains of the acryloyl units. The carbonyl O atoms of the acryloyl systems lie significantly out of these planes, viz. by -0.171 (9) Å for molecule (I) and by 0.33 (1) Å for molecule (II). The acryl-amide and acryloyl planes are inclined at 68.7 (4)° and 59.8 (3)° in the two mol-ecules. The piperidine rings each adopt twist boat conformations. In the crystal, strong N-H⋯O hydrogen bonds link the mol-ecules into zigzag C(4) chains along b. Additional C-H⋯O contacts result in the formation of stacks along a.

| S-EPMC3247421 | biostudies-literature

2,2,6,6-Tetra-bromo-3,4,4,5-tetra-meth-oxy-cyclo-hexa-none.

Project description:In the title compound, C10H14Br4O5, synthesized from the meth-oxy Schiff base N-(pyridin-2-ylmeth-yl)meth-oxy-aniline and mol-ecular bromine, the cyclo-hexa-none ring has a chair conformation with one of the four meth-oxy groups equatorially orientated with respect to the carbonyl group and the others axially orientated. The C-Br bond lengthsvary from 1.942 (4) to1.964 (4) Å. In the crystal, weak C-H⋯Ocarbon-yl hydrogen-bonding inter-actions generate chains extending along the b-axis direction. Also present in the structure are two short inter-molecular Br⋯Ometh-oxy inter-actions [3.020 (3) and 3.073 (4) Å].

| S-EPMC4120536 | biostudies-literature

5,10,15,20-Tetra-kis(1-methyl-pyridinium-4-yl)porphyrin tetra-iodide tetra-hydrate.

Project description:The asymmetric unit of the title compound, C(44)H(38)N(8) (2+)·4I(-)·4H(2)O, comprises two halves of non-equivalent cations of 5,10,15,20-tetra-kis-(1-methyl-pyridinium)porphyrin (with the full mol-ecule of each completed by the application of inversion symmetry), four charge balancing iodide anions and four water mol-ecules of crystallization (two water mol-ecules are fully occupied and four mol-ecules have a site occupancy of 50%). The porphyrin cations are arranged into supramolecular columns parallel to the b axis, mediated by π-π [centroid-centroid distance = 3.762 (4) Å] and C-H⋯π supra-molecular inter-actions [C⋯centroid distance = 3.522 (7) Å, C-H⋯centroid = 128°], leading to the formation of columns parallel to the b axis. The close packing leads to the presence of a one-dimensional channel filled with partially occupied water mol-ecules engaged in O-H⋯O and O-H⋯I hydrogen bonds.

| S-EPMC3238830 | biostudies-literature

Tetra-kis(4-methyl-2-thien-yl)tin(IV).

Project description:The mol-ecule of the title compound, [Sn(C(5)H(5)S)(4)], lies on a special position of site symmetry. The Sn(IV) atom shows a slightly distorted tetra-hedral coordination.

| S-EPMC2959511 | biostudies-literature

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data