scholarly journals The bis(Biphenyl)phosphorus Fragment in Trivalent and Tetravalent P-Environments

Inorganics ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 82
Author(s):  
Jonas Hoffmann ◽  
Daniel Duvinage ◽  
Enno Lork ◽  
Anne Staubitz
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Analysis ◽  
Heteronuclear Nmr ◽  
Ortho Position ◽  
Group 14 ◽  
Reaction Conditions ◽  
Synthetic Routes ◽  
Sterically Hindered

Diaryl substituted phosphorus (III) compounds are commonly used motifs in synthesis. Although the basic synthetic routes to these molecules starting from PCl3 are well reported, sterically hindered aryl substituents can be difficult to introduce, especially if the P atom is in ortho position to another group. This work explores the chemistry of the bis(biphenyl)phosphorus(III) fragment. As third substituents, H, M, Cl, NR2, two group 14 element substituents and also Li were introduced in high-yielding processes offering a wide chemical variety of the bis(biphenyl) phosphine motif. In addition, also a tetravalent phosphine borane adduct was isolated. All structures were thoroughly investigated by heteronuclear NMR spectroscopic analysis. Furthermore, the reaction conditions are discussed in connection with the structures and four crystal structures of the aminophosphine, phosphine, phosphine borane and phosphide are provided. The latter crystallized as a dimer with a unique planar P2Li2 ring, which is stabilized by the non-covalent C⋯Li interaction arising from the biphenyl motif and represents a rare example of a donor-free planar P2Li2 ring.

Novel Synthetic Routes to s-Block Metal 2,5-Diphenylphospholides and Crystal Structures of the Bis(tetrahydrofuran) Complexes of the Potassium, Calcium, and Strontium Derivatives

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1360-1368 ◽  
Author(s):  
Katja Wimmer ◽  
Christin Birg ◽  
Robert Kretschmer ◽  
Tareq M.A. Al-Shboul ◽  
Helmar Görls ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Chain Structure ◽  
Molecular Structures ◽  
Metathesis Reaction ◽  
Sandwich Complex ◽  
Coordination Site ◽  
Metal Atoms ◽  
Synthetic Routes ◽  
A Chain

The reduction of 1,4-diphenyl-1,4-bis(diphenylphosphanyl)buta-1,3-diene (1) (1,4-diphenyl- NUPHOS) with potassium in THF yields bis(THF)potassium 2,5-diphenylphospholide (2) which crystallizes with a chain structure. The metathesis reaction of 2 with the iodides of calcium, strontium, and barium leads to the formation of [bis(THF)calcium bis(2,5-diphenylphospholide)] (3), [bis(THF)strontium bis(2,5-diphenylphospholide)] (4), and [bis(THF)barium bis(2,5-diphenylphospholide)] (5). The reaction of M{P(H)SiiPr3}2 with diphenylbutadiyne in THF also leads to the formation of the 2,5-diphenylphospholides of calcium (3), strontium (4), and barium (5). The molecular structures of 2 to 4 are discussed. The environment of the metal atoms is very similar in all these compounds: The metal atoms show an η5 coordination to the phospholide rings forming a bent sandwich complex. The open coordination site is occupied by two THF molecules

Nucleophilic substitution approach towards 1,3-dimethylbarbituric acid derivatives—new synthetic routes and crystal structures

Tetrahedron ◽  
2012 ◽  
Vol 68 (4) ◽  
pp. 1005-1010 ◽  
Author(s):  
Eyad Mallah ◽  
Kamal Sweidan ◽  
Jörn Engelmann ◽  
Manfred Steimann ◽  
Norbert Kuhn ◽  
...  
Keyword(s):  
Nucleophilic Substitution ◽  
Crystal Structures ◽  
Synthetic Routes

ChemInform Abstract: Selective Synthetic Routes to Sterically Hindered Unsymmetrical Diaryl Ketones via Arylstannanes.

ChemInform ◽  
2011 ◽  
Vol 42 (25) ◽  
pp. no-no
Author(s):  
Marcos J. Lo Fiego ◽  
Gustavo F. Silbestri ◽  
Alicia B. Chopa ◽  
Maria T. Lockhart
Keyword(s):  
Synthetic Routes ◽  
Sterically Hindered

Varying structural motifs in the salen based metal complexes of Co(ii), Ni(ii) and Cu(ii): synthesis, crystal structures, molecular dynamics and biological activities

2016 ◽  
Vol 45 (47) ◽  
pp. 19096-19108 ◽  
Author(s):  
Anoop Kumar Saini ◽  
Pratibha Kumari ◽  
Vinay Sharma ◽  
Pradeep Mathur ◽  
Shaikh M. Mobin
Keyword(s):  
Molecular Dynamics ◽  
Metal Complexes ◽  
Crystal Structures ◽  
Biological Activities ◽  
Biological Applications ◽  
Reaction Conditions ◽  
Structural Motifs

Four new metal complexes which demonstrates varying structural motifs from monomeric to dimeric to tetrameric complexes by slightly altering the reaction conditions and their biological applications.

The Synthesis of Zinquin Ester and Zinquin Acid, Zinc(II)-Specific Fluorescing Agents for Use in the Study of Biological Zinc(II)

1996 ◽  
Vol 49 (5) ◽  
pp. 561 ◽  
Author(s):  
IB Mahadevan ◽  
MC Kimber ◽  
SF Lincoln ◽  
ERT Tiekink ◽  
AD Ward ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Crystal Structures ◽  
Electrophilic Substitution ◽  
Ethyl Acrylate ◽  
Heck Coupling ◽  
Ethyl Bromoacetate ◽  
Reaction Conditions ◽  
Bromo Derivative ◽  
Boron Tribromide

The syntheses of Zinquin ester [ethyl [2-methyl-8-(p- tolylsulfonylamino )-6-quinolyloxy]acetate] and the corresponding acid, both of which are zinc(II)-specific fluorophores , are described. 6-Methoxy-2-methyl-8-(p- tolylsulfonylamino ) quinoline (2) can be demethylated , with boron tribromide, to form either the expected phenol or a mixture of the phenol and the corresponding 5-bromo derivative depending upon the reaction conditions. These compounds react with ethyl bromoacetate to give the corresponding esters, as well as the 5-ethoxycarbonyl derivative formed by electrophilic substitution. Halogenation of the sulfonamide (2) occurs readily at the 5-position. The 5-iodo product undergoes a Heck coupling with ethyl acrylate . The crystal structures of ethyl [5-ethoxycarbonylmethyl-2-methyl-8-(p- tolylsulfonylamino )-6-quinolyloxy]acetate and [5-carboxymethyl-2-methyl-8-(p- tolylsulfonylamino )-6-quinolyloxy]acetic acid are described.

scholarly journals Old Molecule, New Chemistry: Exploring Silicon Phthalocyanines as Emerging N-Type Materials in Organic Electronics

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1334 ◽  
Author(s):  
Nathan J. Yutronkie ◽  
Trevor M. Grant ◽  
Owen A. Melville ◽  
Benoît H. Lessard ◽  
Jaclyn L. Brusso
Keyword(s):  
Organic Thin Film Transistors ◽  
Organic Thin Film ◽  
Field Effect Mobility ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
High Performing ◽  
Silicon Phthalocyanines ◽  
Electron Field ◽  
Synthetic Routes ◽  
Average Electron

Efficient synthesis of silicon phthalocyanines (SiPc) eliminating the strenuous reaction conditions and hazardous reagents required by classical methods is described. Implementation into organic thin-film transistors (OTFTs) affords average electron field-effect mobility of 3.1 × 10−3 cm2 V−1 s−1 and threshold voltage of 25.6 V for all synthetic routes. These results demonstrate that our novel chemistry can lead to high performing SiPc-based n-type OTFTs.

Effect of Substituent on Crystal Structures of N-(Substituted- phenyl)-2,2,2-Trichloroacetamides, 2/3/4-XC 6 H 4 .NHCO.CCl 3 (X = Cl, NO 2 or CH 3 )

2000 ◽  
Vol 55 (8) ◽  
pp. 711-720 ◽  
Author(s):  
B. Thimme Gowda ◽  
Helmut Paulus ◽  
Hartmut Fuess
Keyword(s):  
Crystal Structures ◽  
Phenyl Ring ◽  
Room Temperature ◽  
Ortho Position ◽  
Asymmetric Unit ◽  
Strong Electron ◽  
Bond Angles ◽  
Lattice Constants ◽  
Crystal Type

Abstract The crystal structures of N-(substitutedphenyl)-2,2,2-trichloroacetamides of the type 2/3/4-XC6H4.NHCO.CCl3 (X = CI, NO2 or CH3), namely, N-(3-nitrophenyl)-2,2,2-trichloroacetamide,3-NO2C6H4.NHCO.CCl3 (m-NO2PhTCA); N-(4-nitrophenyl)-2,2,2-trichloroacetamide,4-NO2C6H4.NHCO.CCl3 (p-NO2PhTCA); N-(2-chlorophenyl)-2,2,2-trichloroacetamide,2-ClC6H4.NHCO.CCl3 (o-ClPhTCA) and N-(4-chlorophenyl)-2,2,2-trichloroacetamide, 4-C1C6H4.NHCO.CCl3 (p-ClPhTCA) have been determined at room temperature. The presentdata are analysed along with our earlier crystal structures of N-(2-nitrophenyl)-2,2,2-trichloroacetamide,2-NO2C6H4.NHCO.CCl3 (o-NO2PhTCA); N-(4-methylphenyl)-2,2,2-trichloroacetamide,4-CH3C6H4. NHCO.CCl3 (p-CH3PhTCA); N-(phenyl)-2,2,2-trichloroacetamide,C6H5.NHCO.CCl3 (PhTCA); N-chloro-N-(phenyl)-2,2,2-trichloroacetamide, C6H5.NClCO.CCl3(NClPhTCA); and finally with N-(phenyl) acetamide, C6H5.NHCO.CH3 (PhA). The crystal type,space group, formula units and lattice constants in Å of the new structures are; m-NO2PhTCA:triclinic, PI, Z = 4, a = 7.493(3), b = 9.992(3), c = 15.225(5), α = 84.16(2)°, β = 82.59(2)°, γ =84.92(2); p-N02PhTCA: monoclinic, P21/n, Z = 4, a = 5.807(2), b = 15.354(6), c = 12.475(5),β = 92.28(2)°; o-ClPhTCA: orthorhombic, Pna21, Z = 4, a = 8.769(2), b = 12.838(3), c = 9.578(2)and p-ClPhTCA: orthorhombic, Pbca, Z = 8, a = 9.742(4), b = 10.031(4), c = 23.110(9). Thecompounds, m-NO2PhTCA, o-NO2PhTCA and p-CH3PhTCA show two molecules each in theirasymmetric units. This is in agreement with the multiple lines observed in the 35Cl NQR spectraof the latter two compounds. But the presence of two molecules in the asymmetric unit of m-NO2PhTCA indicates that it may undergoe a phase transition below room temperature. The bondlengths and bond angles are normal except for some deviations. The presence of strong electronwithdrawing group at the ortho position of the phenyl ring and N-chlorination of the amide willhave significant effect on some bond distances and bond angles.

scholarly journals Computational searches for crystal structures of dioxides of group 14 elements (CO2, SiO2, GeO2) under ultrahigh pressure

RSC Advances ◽  
2020 ◽  
Vol 10 (37) ◽  
pp. 22156-22163
Author(s):  
Hitoshi Nabata ◽  
Makito Takagi ◽  
Kenichiro Saita ◽  
Satoshi Maeda
Keyword(s):  
Crystal Structures ◽  
Ultrahigh Pressure ◽  
Group 14 ◽  
Effect Of Pressure ◽  
Group 14 Elements

In this study, we focused on the effect of pressure on the crystal structures of dioxides of group 14 elements, i.e. SiO2, GeO2, and CO2.

Variation of nuclearity in NiII complexes of a Schiff base ligand: crystal structures and magnetic studies

CrystEngComm ◽  
2019 ◽  
Vol 21 (31) ◽  
pp. 4620-4631 ◽  
Author(s):  
Tanmoy Kumar Ghosh ◽  
Prithwish Mahapatra ◽  
Subrata Jana ◽  
Ashutosh Ghosh
Keyword(s):  
Schiff Base ◽  
Crystal Structures ◽  
Schiff Base Ligand ◽  
Magnetic Coupling ◽  
Magnetic Studies ◽  
Reaction Conditions

Four NiII complexes have been synthesized by changing the reaction conditions and stoichiometry of the reactants. The magnetic coupling in the NiII4 complex is ferromagnetic whereas that in the NiII6 complex is antiferromagnetic.

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