HEXAMETHYLDISILOXANE: CHEMICAL THERMODYNAMIC PROPERTIES AND INTERNAL ROTATION ABOUT THE SILOXANE LINKAGE<sup>1</sup>

Scott, D. W.; Messerly, J. F.; Todd, Samuel S.; Guthrie, G. B.; Hossenlopp, I. A.; Moore, R. T.; Osborn, A.G.; Berg, Wendy K.; McCullough, J. P.

doi:10.1021/j100826a010

Cited by 78 publications

(24 citation statements)

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“…9 compares experimental data in Ref. [18] with values calculated with the SW EoS for MM for the liquid phase isobaric heat capacity C L P . Values calculated with the PRSV EoS are also included to compare the performance of the two models.…”

Section: Hexamethyldisiloxane MM (C 6 H 18 Osi 2 )mentioning

confidence: 95%

“…Experimental values for the isobaric heat capacity in the saturated liquid (C L P ) and the ideal gas (C ig P ) states are available only for MM [18]. These values were obtained from 363 to 500 K. Spectroscopic and molecular structure information were used to calculate C ig P from 273.15 to 1500 K by means of statistical mechanics.…”

Section: Evaluation Of Heat Capacity Datamentioning

confidence: 99%

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Multiparameter equations of state for selected siloxanes

Colonna

Nannan

Guardone

et al. 2006

Fluid Phase Equilibria

134

103

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Section: Hexamethyldisiloxane MM (C 6 H 18 Osi 2 )mentioning

confidence: 95%

Section: Evaluation Of Heat Capacity Datamentioning

confidence: 99%

Multiparameter equations of state for selected siloxanes

Colonna

Nannan

Guardone

et al. 2006

Fluid Phase Equilibria

134

103

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“…Ammonium siloxane compounds without sterically hindering groups are known for their reluctance to form single crystals 31 . This feature can be connected to the absence of strong cohesion forces and excessive conformational flexibility of the Si-O-Si bridge 19 of the molecular cation. However, we succeeded in obtaining single crystals of two salts of the series, which elucidated the characteristic structural and conformational features, as well as the aggregation capabilities of these compounds.…”

Section: Comparison Of 1 H Nmr Spectra Although Not Ideal In Order mentioning

confidence: 99%

Exploring ion-ion preferences through structure-property correlations: amino acid-derived, bis(guanidinium) disiloxane salts

Tabisz

Rozwadowski

Katrusiak

et al. 2020

Sci Rep

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present study that valuable information could be obtained from comparative analysis of series of compounds: complicated enough to include more than one functionality, yet simple enough to allow for differentiation of their individual impact on bulk physicochemical properties. Starting with the abovementioned lysozyme/ionic liquid behaviour discrepancy and wanting to also investigate the structuring effect of anions on the separating organic phase, we decided to synthesize amino acid-linked bis(guanidines), in which the polar moieties are separated by a siloxane bridge. This idea stemmed from a previous study, which revealed an abnormally low water solubility of the prepared 1,3-bis(3-guanidinopropyl)-t etramethyldisiloxane nitrate (parent chloride was fully water-miscible) 17. Addition of amide bonds seemed very attractive, as they often co-exist with guanidine moieties in many polypeptides and are a key ingredient in their higher-than-primary structure. Guanidines, on the other hand, have well-established "chaotropic" properties in their own right 18. Siloxane bridges, though fairly chemically and very thermally resistant, impart a strong tendency for disorganization and non-crystallinity on the molecule, which stems from the extremely low energy barrier for rotation around the Si-O bond 19. This results in most siloxanes presenting as liquids, oils or waxy solids at room temperature (a point of connection with ionic liquids). The apparent crystallinity of the abovementioned nitrate was yet another reason for choosing that particular class of compounds. Apart from the obvious advantage of easily comparable results, one of the drawbacks of articles referring to Hofmeister series as a common denominator is the limitation of studied anions to those with well-established places on that spectrum: phosphate, sulphate, halides, nitrate, perchlorate and thiocyanate. In an effort to find more subtle differences, we expanded our search. For example, while the charge density difference between sulphate and perchlorate explains why these two geometrically similar oxoanions exert significantly different influences on water solutions, we chose chromate and molybdate (same geometry and charge) instead. Azide, an ion very rarely studied in this context, was also included-due to its specific linear geometry (similar to thiocyanate) and significant electronic contribution from the characteristic − N = N + = N − resonance structure. Results and Discussion Design and synthesis. The intramolecular hydrogen bonding between amide moieties determines the

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“…Optical emission is acquired through an optical fibre with an UV-VIS spectrometer. b A section of the electrode system region According to data from [31], at a pressure of 1 bar and at room temperature (25°C), the maximum concentration of HMDSO before condensation occurs is 5.5%.…”

Section: Atmospheric Pressure Processmentioning

confidence: 99%

Atmospheric Pressure Plasma Discharge for Polysiloxane Thin Films Deposition and Comparison with Low Pressure Process

Siliprandi

Zanini

Grimoldi

et al. 2011

Plasma Chem Plasma Process

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An atmospheric pressure dielectric barrier plasma discharge has been used to study a thin film deposition process. The DBD device is enclosed in a vacuum chamber and one of the electrodes is a rotating cylinder. Thus, this device is able to simulate continuous processing in arbitrary deposition condition of pressure and atmosphere composition. A deposition process of thin organosilicon films has been studied reproducing a nitrogen atmosphere with small admixtures of hexamethyldisiloxane (HMDSO) vapours. The plasma discharge has been characterized with optical emission spectroscopy and voltagecurrent measurements. Thin films chemical composition and morphology have been characterized with FTIR spectroscopy, atomic force microscopy (AFM) and contact angle measurements. A strong dependency of deposit character from the HMDSO concentration has been found and then compared with the same dependency of a typical low pressure plasma enhanced chemical vapour deposition process.

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HEXAMETHYLDISILOXANE: CHEMICAL THERMODYNAMIC PROPERTIES AND INTERNAL ROTATION ABOUT THE SILOXANE LINKAGE¹

Cited by 78 publications

References 0 publications

Multiparameter equations of state for selected siloxanes

Multiparameter equations of state for selected siloxanes

Exploring ion-ion preferences through structure-property correlations: amino acid-derived, bis(guanidinium) disiloxane salts

Atmospheric Pressure Plasma Discharge for Polysiloxane Thin Films Deposition and Comparison with Low Pressure Process

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HEXAMETHYLDISILOXANE: CHEMICAL THERMODYNAMIC PROPERTIES AND INTERNAL ROTATION ABOUT THE SILOXANE LINKAGE1

Cited by 78 publications

References 0 publications

Multiparameter equations of state for selected siloxanes

Multiparameter equations of state for selected siloxanes

Exploring ion-ion preferences through structure-property correlations: amino acid-derived, bis(guanidinium) disiloxane salts

Atmospheric Pressure Plasma Discharge for Polysiloxane Thin Films Deposition and Comparison with Low Pressure Process

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HEXAMETHYLDISILOXANE: CHEMICAL THERMODYNAMIC PROPERTIES AND INTERNAL ROTATION ABOUT THE SILOXANE LINKAGE¹