Novel materials based on self-assembly of organophosphonic acids
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We have identified two distinct types of molecular building blocks based on organophosphonic acids for the design of polymeric crown ether assemblies and three-dimensional open structures. The phosphorylated crown ethers, N-(phosphonomethyl)-aza-18-crown-6 (1H2N) and N-(phosphonomethyl)-aza-15-crown-5 (2H2N) form one-dimensional polymeric arrays like 'leaflets' through hydrogen bonded and coordination bonded self-assembly. Nitrilotri(methylphosphonic acid) (3H6N) forms unique three-dimensional hexagonal structures when reacted with amines, 1,7-phenanthroline, 1,10-phenanthroline, acridine and tripropylamine in 1:1 molar ratio. Monodeprotonation of 3H6N in these complexes triggers a prototypal self-complementary 3D hexagonal architecture. The structural features of 1:1 and 1:1.5 complexes of acid 3H6N with acridine reveal the importance of template effects in stabilizing the three-dimensionally hydrogen bonded open structures. 2001 Elsevier Science Ltd. All rights reserved.
author list (cited authors)
Sharma, C., Hessheimer, A. J., & Clearfield, A.
complete list of authors
Sharma, CVK||Hessheimer, AJ||Clearfield, A