X-ray diffraction investigation of trans-2,8-dihydroxy-2,4,4′, 6,6′,8,10,10′,12,12′-decamethyl-5,11-dicarbacyclohexasiloxane and trans-1,4-dihydroxy-1,4-dimethyl-1,4-disilacyclohexane

Polishchuk, A. P.; Макарова, Н. Н.; Astapova, T. V.; Petrova, I. M.

doi:10.1134/1.1509394

Cited by 3 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To reveal specific features associated with the conformational changes in the cyclohexasiloxane moiety upon the introduction of one and two methylene units, two model monomeric compounds, viz. , 2,8-dihydroxy-2,4,4,6,6,8,10,10,12, 12-decamethyl-5-carbacyclohexasiloxane ( MVI - OH ) and 2,8-dihydroxy-2,4,4,6,6,8,10,10,12, 12-decamethyl-5,11-dicarbacyclohexasiloxane ( MVII - OH ), were studied [19,20] by X-ray analysis assuming that the unit of CL POCS would inherit the carbocyclosiloxane conformation. In addition, Compounds MVI - OH and MVII - OH were used to compare their behaviors on the surface of water under lateral compression in order to evaluate the co-operative contribution of the Me 2 SiOSiMe 2 and MeSi(OH)O fragments to the surface of water.…”

Section: Resultsmentioning

confidence: 99%

“…The crystal structures and molecular geometries of Compounds MX - OH [21] and MXI - OH [20] whose conformational features should be retained in the unit of the polymer chain were studied by X-ray analysis.…”

Section: Resultsmentioning

confidence: 99%

“…X-ray data for the molecules of Compound MXI-OH in the crystal [20] suggest another type of association compared to that found for Compounds MII-OH , MVI-OH , and MVII-OH . Compound MXI-OH goes into the mesomorphic state upon melting [25].…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Self-Organizing Cyclolinear Organosilicon Polymers in Bulk and on the Surface of Water

Макарова

Astapova

Бузин

et al. 2013

IJMS

View full text Add to dashboard Cite

Cyclolinear organocarbosiloxane polymers with varying content and location of (CH2)n groups in the monomer unit were synthesized by reactions of heterofunctional polycondensation and polyaddition of difunctional organocyclosiloxanes and organocyclocarbosiloxanes. Their bulk properties were studied by differential scanning calorimetry and X-ray structural analysis. It was shown that on introduction of CH2 groups into the methylcyclohexasiloxane unit, the polymer retains the ability to self-organize with formation of a mesomorphic state in a wide temperature range, while on introduction of (CH2)2 fragments in a cyclotetrasiloxane unit or in a bridge connecting two methylcyclotetra(hexa)siloxane units it does not. Comparison of the X-ray data of dihydroxy derivatives of decamethylcyclohexasiloxane and decamethyl-5-carbocyclohexasiloxane with packing of cyclolinear organosilicon polymers in bulk shows that the polymer inherits the layered type of crystalline structure typical for monomers. Langmuir films of cyclolinear polymethylcarbosiloxanes with different design of monomer units were studied as well. It was revealed that all polymers form monomolecular films at the air/water interface, excluding those having longer hydrophobic fragment than hydrophilic ones. The ability to form multilayers depends on the surroundings of Si atom in the bridge between the cycles.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Self-Organizing Cyclolinear Organosilicon Polymers in Bulk and on the Surface of Water

Макарова

Astapova

Бузин

et al. 2013

IJMS

View full text Add to dashboard Cite

show abstract

“…The research of new promising materials for the engineering and the development of devices for data processing and storage is one of the important directions of modern science. Due to the recent trends, the great attention is paid to the studies of untraditional types of liquid crystals (LC) such as organosilicon compounds [1,2], Schiff base metal complexes [3,4], and ITLC of alkanoic acid homologs. The latter are characterized by the presence of intrinsic ionic conductivity [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Electric Properties of Ionic Thermotropic Liquid Crystals

Gridyakina¹

2016

Ukr. J. Phys.

View full text Add to dashboard Cite

This work presents the results of studies of the electric properties of samples of oriented ionic thermotropic liquid crystals (ITLC) of cobalt decanoate, lead decanoate, and their binary mixture. It is found that all studied samples in the temperature range, where a liquid crystal exists, are weak electrolytes. All investigated compounds are characterized by an anisotropy of bulk conductivity caused by the ordering of molecules. The values of electric conductivity, activation energy, charge mobility, and concentration are estimated. K e y w o r d s: ionic thermotropic liquid crystals, cobalt alkanoate, lead alcanoate, binary mixture, conductivity, anisotropy of conductivity.

show abstract

First Synthesis of the Three Isomeric Parent Disilacyclohexanes. An Improved Preparation of Methylene Di-Grignard

Gudnason

Arnason

2009

Org. Lett.

View full text Add to dashboard Cite

show abstract

X-ray diffraction investigation of trans-2,8-dihydroxy-2,4,4′, 6,6′,8,10,10′,12,12′-decamethyl-5,11-dicarbacyclohexasiloxane and trans-1,4-dihydroxy-1,4-dimethyl-1,4-disilacyclohexane

Cited by 3 publications

References 11 publications

Self-Organizing Cyclolinear Organosilicon Polymers in Bulk and on the Surface of Water

Self-Organizing Cyclolinear Organosilicon Polymers in Bulk and on the Surface of Water

Electric Properties of Ionic Thermotropic Liquid Crystals

First Synthesis of the Three Isomeric Parent Disilacyclohexanes. An Improved Preparation of Methylene Di-Grignard

Contact Info

Product

Resources

About