Anion-pi interactions in layered structures of salts of 5-(hydroxyimino) quinolin-8-one and related salts

作者：Khakhlary Prithiviraj; Baruah Jubaraj B^*

来源：Journal of Chemical Sciences, 2015, 127(1): 95-102.

DOI：10.1007/s12039-014-0753-2

• Layered structures
• anion-pi interactions
• quinoline salts
• crystal structures
• optical properties

Relevance of anion-pi interactions in chloride, bromide, nitrate and perchlorate salts of 5(hydroxyimino)quinolin-8-one are discussed. Structures of nitrate salt of 5-aminoquinoline as well as nitrate salt of 4-hydroxyquinazoline are compared with the structure of nitrate salt of 5-(hydroxyimino)quinolin-8-one. From such a comparison, two different arrangements of nitrate ions with respect to the respective cations are discerned. Nitrate ions are sandwiched between aromatic planes of cations in nitrate salts of 5(hydroxyimino)quinolin-8-one or 4-hydroxyquinazoline; whereas, nitrate ions are in oblique positions with respect to aromatic planes of counter cations in nitrate salt of 5-aminoquinoline. Binding constants of different nitrate salts in solution are determined by UV-visible spectroscopic titrations. Solution study shows formation of ion-pairs of these salts in solution.

• 出版日期2015-1