Swati Chatterjee

A study of supramolecular hydrogen bonded complexes formed by aliphatic dicarboxylic acids with azaaromatic donors

Abstract Crystal structures of the hydrogen bonded, 1:1 molecular complexes of malonic, glutaric, adipic, thiodiglycolic and thiodipropionic acids with 4,4′-bipyridyl have been investigated in detail. All the dicarboxylic acids form molecular tape-like structures, but thiodiglycolic acid gives a cyclic structure, favoured by intermolecular π- π interaction between the heteroatom-rings. The cyclic structure is indeed unique, in the sense that it represents a noncovalent synthesis of a rectangle. Crystal structures of hydrogen bonded molecular complexes of malonic, succinic, glutaric, adipic and thiodipropionic acids with 2,4,6-triaminopyrimidine have been studied. By and large, only tape-like structures are formed, the crossed ribbon network being favoured in the complexes of malonic and glutaric acids with an odd number carbon atoms. In all the complexes of 2,4,6-triaminopyrimidine, proton transfer occurs from the carboxyl group to the heteroatom nitrogen, giving rise to a strong hydrogen bonded cyclic system.

Self-assembled four-membered networks of trimesic acid forming organic channel structures

Abstract By the co-crystallization of trimesic acid, TMA, with molecules such as dimethylamine, N,N,N′,N′-tetramethylethylenediamine and methanol, it has been possible to generate hydrogen-bonded four-membered networks of TMA. The three-dimensional arrangement of the four-membered networks gives rise to channels occupied by the guest molecules. It has also been possible to generate a four-membered network by co-ordination of TMA with Co(II).

Layered structures formed by dinitrobenzoic acids

Abstract 3,5-dinitrobenzoic acid, 1 and 3,5-dinitro-4-methylbenzoic acid, 2 , form cocrystals with 4,4′-bipyridyl but only the latter forms a layered structure, which can incorporate anthracene molecules. Furthermore, 2 forms a pillared type structure with thionicotinamide.

Iodosonaphthoate catalysts for the cleavage of a reactive phosphate

Abstract Iodosonaphthoates 3–5 are potent catalysts for the hydrolysis of p -nitro-phenyldiphenyl phosphate.

A convenient preparation of 1,2-diacylglycerols; o-iodobenzoyl as a protecting group

Abstract The o -iodobenzoyl moiety is a useful 3-hydroxyl protecting group in the synthesis of 1,2-diacylglycerols; it can be removed by chlorination followed by mild basic hydrolysis.