Dielectric relaxation studies of dilute solutions of amides

Malathi, M.; Sabesan, R.; Krishnan, S.

doi:10.1016/s0921-5107(03)00141-7

Cited by 18 publications

(11 citation statements)

References 14 publications

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“…It is evident that the frequency of the electric field is the reason for the slight discrepancies of μ theo s, μ s s and μ j s. The associational behaviours of the polar molecules are given in figure 2. The primary and secondary amides show the self-association or solute-solute (dimer) molecular association through the hydrogen bond in 1,4-dioxan or C 6 H 6 [3,12]. One such typical solute-solute (dimer) association for NMA in C 6 H 6 is given in figure 2(iii(b)).…”

Section: Resultsmentioning

confidence: 99%

“…It is important to understand the mutual interaction of amides with nonpolar solvents to shed light on the conformational stability of protein molecules [3]. It is also very much essential to determine μ s s, the dipole moments of formamides and amides under static or low-frequency electric field to understand the solute-solvent (monomer) and solute-solute (dimer) molecular associations.…”

Section: Introductionmentioning

confidence: 99%

“…However, the dielectric behaviours of several primary, secondary and tertiary amides dissolved in nonpolar solvent under static or low-frequency electric field have not been studied so far. The formamides and amides are excellent donors and acceptors of protons [3] which associate themselves by hydrogen bonding. The conformational structures of the polar molecules in terms of μ theo s were also ascertained from the available bond angle and bond moment data [8] to get exact estimated μ cal s where inductive, mesomeric and electromeric effects play vital roles.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric behaviour of some amides and formamides dissolved in nonpolar solvents under static electric field

Sahoo

Sit

2011

Pramana - J Phys

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Structural and associational aspects of polar amides ( j) like formamide, acetamide, Nmethyl acetamide (NMA), N,N-dimethyl formamide (DMF), N,N-dimethyl acetamide (DMA) and acetanilide dissolved in the nonpolar solvent (i) benzene or 1,4-dioxan have been estimated from the measured static relative permittivity ε 0ij and high-frequency permittivity ε ∞ij at different weight fractions w j s of polar solute at 35 • C under static electric field using Debye model of polar liquid molecule. The static dipole moments μ s s are compared with μ j s reported from conductivity method and theoretical μ theo s to get exact μ cal . μ theo s of the molecules are predicted from the available bond angles and bond moments where difference in electron affinity exists between two adjacent atoms of a polar group due to inductive, mesomeric and electromeric effects in them. Solute-solute molecular association for NMA in benzene and solute-solvent association for other amides are ascertained to arrive at their conformational structures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dielectric behaviour of some amides and formamides dissolved in nonpolar solvents under static electric field

Sahoo

Sit

2011

Pramana - J Phys

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“…To understand the molecular behavior of associating molecules, it is necessary to determine the various dielectric parameters, which are related to inter-and intra-molecular *Corresponding Author association and molecular rotations with temperature variation [6,7]. The Kirkwood-Fröhlich theory of dipolar liquids [8] defines the short-range dipolar interactions through a dimensionless linear correlation factor, g. In our earlier report [9] we have evaluated the linear correlation factor, g, excess molar polarization, P and excess free energy of mixing, F, of the binary mixtures of MIBK in three apolar solvents viz., benzene, carbon tetrachloride and p-xylene.…”

Section: Introductionmentioning

confidence: 99%

Dielectric response of methyl isobutyl ketone (MIBK) in apolar solvents: solute-solvent interactions

Dash

Das²,

Dalai

et al. 2009

Indian J Phys

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Dielectric constants of binary mixtures of MIBK, an extractant used in nuclear energy industry, with six apolar solvents i.e. benzene, dioxane, cyclohexane, carbon tetrachloride, p-xylene and n-heptane have been measured at 455 kHz. The data are used to evaluate the Eyring's structural parameter, G*, in these systems to assess the nature of non-specific solute-solvent interaction. The value of G* is found to be influenced by the nature of the solvent.

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“…In the case of amides, N, N-dimethylformamide (DMF) is able to form the H-bonded network structures with dipolar aprotic and protic solvents [6]. Malathi M. et al have studied mutual interaction of amides with non polar solvents to understand the conformational stability of protein molecules [7]. Thenappan and Sankar were studied hydrogen-bonded complexes of alcohol with N, N-dimethylformamide (DMF) [8].…”

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confidence: 99%

Dielectric Relaxation Study of Aqueous Amides in Non-Polar Solute Using Picoseconds Time Domain Technique

Mahajan¹,

Kumbharkhane²

2012

IJBBB

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Abstract-The dielectric permittivity of amide -1, 4-dioxane (DX) for various concentrations has been studied in the frequency range from 10 MHz to 30 GHz using the time domain reflectometry (TDR) method. A hydrogen bonded theory suggested by Luzar is applied to compute correlation terms for the mixtures. Static permittivity for the mixtures can be explained using the Luzar model by assuming the formation of two types of hydrogen bonded dimmers, one between amide-amide (pair 1) and other between amide-1, 4-dioxane (pair 2). The numbers of these pairs are also estimated as a function of concentration. Index Terms-Dielectric permittivity, relaxation time, time domain reflectometry (TDR), bruggeman factor I. INTRODUCTIONAmide represents an important class of bio-organic solvent. The hydrogen bond formation ability of these solvents is useful in understanding the peptide linkage in complex bio-systems [1]- [3]. The study of hydrogen bonding molecular interactions of binary mixtures is currently a significant challenge in the research field of science and technology. Hydrogen bond constitutes a very interesting class of intermolecular interactions, which are of extreme importance in many fields of chemistry and molecular biology. "Hydrogen Bonding in Biological Structures" can be used in many ways by biophysicists [4]. The study of the H-bonds of the type O=H ---O=C occupies a position of considerable importance as it relates to the study of biopolymers [5]. In the case of amides, N, N-dimethylformamide (DMF) is able to form the H-bonded network structures with dipolar aprotic and protic solvents [6]. Malathi M. et al. have studied mutual interaction of amides with non polar solvents to understand the conformational stability of protein molecules [7]. Thenappan and Sankar were studied hydrogen-bonded complexes of alcohol with N, N-dimethylformamide (DMF) [8]. DMF is a widely used solvent for many recently developed synthetic procedures because of its powerful solvating properties [9]. N-methylacetamide (NMA) is the most frequently used analog compound for the peptide unit in Manuscript received February 4, 2012; revised March 25, 2012 proteins. Paul Firman and S. Sahoo were studied the mixture of N-methylacetamaide (NMA) with non-polar solvent [10], [11]. The non polar solvent 1, 4-dioxane (DX) is used as a laboratory reagent and as a solvent for the production of cellulose acetate, ethyl cellulose, benzyl cellulose, dyes, oils, fats and polyvinyl polymers. The intermolecular interaction plays an important part in intermolecular recognition processes essential to most of biological systems. It also found that Physical and chemical phenomenon of binary systems are closely related to the intermolecular interactions.In the present work, we report a comparative dielectric relaxation study of amide (DMF and NMA) with non polar solute (DX) at various concentrations at 25 o C employing Time Domain Reflectometry (TDR) in the frequency range of 10 MHz-30 GHz. The complex permittivity spectra of DMF-DX and NMA-DX have been fitt...

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Dielectric relaxation studies of dilute solutions of amides

Cited by 18 publications

References 14 publications

Dielectric behaviour of some amides and formamides dissolved in nonpolar solvents under static electric field

Dielectric behaviour of some amides and formamides dissolved in nonpolar solvents under static electric field

Dielectric response of methyl isobutyl ketone (MIBK) in apolar solvents: solute-solvent interactions

Dielectric Relaxation Study of Aqueous Amides in Non-Polar Solute Using Picoseconds Time Domain Technique

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