Excess isentropic compressibilities of N,N-dimethylformamide and N,N-dimethylacetamide with aliphatic esters at 303.15 K

Rao, K. Purnachandra

doi:10.1016/0041-624x(90)90008-c

Cited by 26 publications

(29 citation statements)

References 7 publications

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“…In the case of CPD -56° 8032, its observed UV spectrum falls below model predictions, reddened by E (B -V) = 0.68 using the standard extinction curve of Howarth (1983). The poor match may result from (i) photometric variability, 1 (ii) a non-standard extinction curve along this line of sight as deduced by Rao, Giridhar & Nandy (1990), Jeffery (1995) and in Paper I, or (iii) a lower interstellar extinction [E (B -V) -0.5] than is implied from nebular observations. Fig.…”

Section: Observationsmentioning

confidence: 91%

The WC10 central stars CPD - 56 8032 and He 2-113 - II. Model analysis and comparison with nebular properties

Marco¹,

Crowther²

1998

Monthly Notices of the Royal Astronomical Society

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We present detailed atmospheric analyses of two [WC10] central stars of planetary nebulae (PNe), CPD -56° 8032 and He 2-113, the results of which are compared with parameters inferred from their nebular properties. Our quantitative study is based on non-LTE modelling of diagnostic He C and 0 lines. We find that spectroscopic similarities are reflected in the derived stellar properties: for both stars we obtain Teff' 30 kK and log LIL® = 3.7; log (1t. ///Mo yr') = -5.4 and vo" = 225 km s' for CPD -56° 8032, while log (MIM ® yr -1 ) = -6.1 and vac = 160 km s' for He 2-113.The derived stellar properties are fairly consistent with the recent study of Leuenhagen et al., when adjusted for the different distances adopted. We find excellent agreement between our C 2 + wind temperature and the independent determination by De Marco et al., supporting our assumption of radiative equilibrium. We find that both stars are highly enriched in carbon and oxygen, but with stellar hydrogen undetectable for He 2-113 (in contrast to Leuenhagen et al.). Our final abundance determinations indicate H:He:C:O mass fractions of 0:34:52:14 for CPD -56° 8032 and 0:34:54:13 for He 2-113.We confront our model flux distributions with observed nebular properties using Zanstra and photoionization techniques, and identify a major discrepancy between the observed and predicted nebular properties for these particular PNe. The hydrogen ionizing fluxes predicted by our WR non-LTE models greatly exceed those implied by nebular observations. The lack of heavy-element line blanketing in our wind models could be responsible. However, the geometry and high nebular densities of these PNe suggest that they represent poor probes of the Lyman continuum flux of their central stars.

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Section: Observationsmentioning

confidence: 91%

The WC10 central stars CPD - 56 8032 and He 2-113 - II. Model analysis and comparison with nebular properties

Marco¹,

Crowther²

1998

Monthly Notices of the Royal Astronomical Society

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“…The volumetric properties of amide aqueous solutions have been extensively studied: formamide [1][2][3][4][5], N-methylformamide [5][6][7], N,N-dimethylformamide [3][4][5][7][8][9][10], N,N-dimethylacetamide [1][2][3][4][11][12][13][14], pyrrolidin-2-one [5,7,15,16], N-methyl-2-pyrrolidinone [5,7,[16][17][18]. The ultrasonic behavior of amides in water [4,9,16,19,20] or other solvent mixtures [21][22][23][24][25] has been also reported as well as their dielectric constants [15,26] and viscosity behavior [4,5,13,14,[16]…”

Section: Introductionmentioning

confidence: 99%

Isentropic compressibilities of (amide+water) mixtures: A comparative study

Papamatthaiakis¹,

Aroni²,

Havredaki³

2008

The Journal of Chemical Thermodynamics

100

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“…[38] This is associated with preserved internal architecture of the channel after functionalization without destroying the internal walls of the material.…”

Section: Characterization Of Functionalised Silicamentioning

confidence: 99%

“…[38] As a result of the coupling of the adsorption -desorption isotherm is obtained a hysteresis loop of H2 type specific for the materials that contain network of interconnected micropores of various sizes in their structure.…”

Section: Characterization Of Functionalised Silicamentioning

confidence: 99%

Immobilised Co(II) Homodinuclear Coordinative Compound with Terephthalate and o-phenanthroline as Ligands: Synthesis, Crystal Structure and Applications

Blegescu¹,

Ganju²,

Shova³

et al. 2017

Croat. Chem. Acta

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Homodinuclear coordinative compound of Co(II) with terephthalate bridge and o-phenanthroline has been synthesized and characterized by elemental analysis, FT-IR spectroscopy, thermal analysis. The crystal structure was determined by single crystal X-ray diffraction technique. The coordinative compound was immobilized into functionalized silica with thiol groups and tested for its catalytic activity towards styrene oxidation in the presence of H2O2. A conversion of 89.75 % and selectivity of 85.4 % for benzaldehyde formation was obtained.

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Excess isentropic compressibilities of N,N-dimethylformamide and N,N-dimethylacetamide with aliphatic esters at 303.15 K

Cited by 26 publications

References 7 publications

The WC10 central stars CPD - 56 8032 and He 2-113 - II. Model analysis and comparison with nebular properties

The WC10 central stars CPD - 56 8032 and He 2-113 - II. Model analysis and comparison with nebular properties

Isentropic compressibilities of (amide+water) mixtures: A comparative study

Immobilised Co(II) Homodinuclear Coordinative Compound with Terephthalate and o-phenanthroline as Ligands: Synthesis, Crystal Structure and Applications

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