Journal of Molecular Liquids

1988

DOI: 10.1016/0167-7322(88)80015-1

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Dielectric relaxation of benzophenone and some of its derivatives in the liquid state part I: Dimethyl- and chlorobenzophenones as pure liquid and as highly concentrated solutions in nonpolar solvents

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Dielectric Properties of Morpholine and Some of Its Derivatives in the Pure Liquid State and in Mixtures with Benzene or Water

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et al. 1990

Ber Bunsenges Phys Chem

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The following substances are regarded as pure liquids and in benzene mixtures: morpholine, 2,6‐dimethylmorpholine, N‐methyl‐(MeMo), N‐ethyl‐, N‐cyano‐(CyMo) and N‐formylmorpholine (FoMo). Their dielectric constant and complex permittivity over the whole dispersion range (up to 72 GHz) are determined at 20°C. By comparing dipole moments in dilute benzene solution and in the pure state and by considering the relaxation times, probable molecular conformations and the association behaviour are discussed. Chair forms are most likely, but some parameters point to enhanced planarity of CyMo and FoMo. Self‐association (probably dimerization) occurs if there is no N‐substituent. Additional relaxation measurements on aqueous mixtures of MeMo and FoMo reveal a considerable tendency towards hetero‐association.

Dielectric Properties of Morpholine and Some of Its Derivatives in the Pure Liquid State and in Mixtures with Benzene or Water

¹

,

²

,

³

et al. 1990

Ber Bunsenges Phys Chem

Self Cite

View full text Add to dashboard Cite

The following substances are regarded as pure liquids and in benzene mixtures: morpholine, 2,6‐dimethylmorpholine, N‐methyl‐(MeMo), N‐ethyl‐, N‐cyano‐(CyMo) and N‐formylmorpholine (FoMo). Their dielectric constant and complex permittivity over the whole dispersion range (up to 72 GHz) are determined at 20°C. By comparing dipole moments in dilute benzene solution and in the pure state and by considering the relaxation times, probable molecular conformations and the association behaviour are discussed. Chair forms are most likely, but some parameters point to enhanced planarity of CyMo and FoMo. Self‐association (probably dimerization) occurs if there is no N‐substituent. Additional relaxation measurements on aqueous mixtures of MeMo and FoMo reveal a considerable tendency towards hetero‐association.

Dielectric relaxation of benzophenone and some of its derivatives in the liquid state

¹

,

²

,

³

1989

Journal of Molecular Liquids

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