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英语翻译
Complex formation of a- and b-cyclodextrins
with isomeric pyridinecarboxylic acids (picolinic,nicotinic
and isonicotinic acids) in water were studied by calorimetry
and 1H NMR at 298.15 K.The obtained results revealed the
weak 1:1 complex formation governed by the cavity dimensions
and position of the carboxylic group in the pyridine ring.
It was found that selective inclusion complex formation of aand
b-cyclodextrins with nicotinic and isonicotinic acids takes
place.In the case of picolinic acid,the considerable role of
external interactions and formation of less stable complexes
were detected.The location of the carboxylic group in the
meta-position of pyridine ring is more favorable for the
effective binding.The pyridinecarboxylic acids are shallow
inserted into a-cyclodextrin cavity possessing the smaller
diameter,while they are deeply included into b-cyclodextrin
cavity.Thermodynamic parameters of complex formation (K,
DcG0,DcH0 and DcS0) were calculated and discussed in terms
of influence of reagents structure.
Complex formation of a- and b-cyclodextrins
with isomeric pyridinecarboxylic acids (picolinic,nicotinic
and isonicotinic acids) in water were studied by calorimetry
and 1H NMR at 298.15 K.The obtained results revealed the
weak 1:1 complex formation governed by the cavity dimensions
and position of the carboxylic group in the pyridine ring.
It was found that selective inclusion complex formation of aand
b-cyclodextrins with nicotinic and isonicotinic acids takes
place.In the case of picolinic acid,the considerable role of
external interactions and formation of less stable complexes
were detected.The location of the carboxylic group in the
meta-position of pyridine ring is more favorable for the
effective binding.The pyridinecarboxylic acids are shallow
inserted into a-cyclodextrin cavity possessing the smaller
diameter,while they are deeply included into b-cyclodextrin
cavity.Thermodynamic parameters of complex formation (K,
DcG0,DcH0 and DcS0) were calculated and discussed in terms
of influence of reagents structure.
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