PyC60-naphthacrown system: A new supramolecular recognition element
作者:Debabrata Pal、Kshama Kundu、Sandip K. Nayak、Sumanta Bhattacharya
DOI:10.1016/j.saa.2014.09.020
日期:2015.3
phenomenon in solution to generate a new supramolecular recognition element having binding constant value of ∼5.83×10(4)dm(3)mol(-1). Lifetime measurement reveals a static quenching mechanism behind the deactivation of photoexcited state of 1 in presence of PyC60. The results obtained from this work would definitely reinforce bridged cyclic crown ether as one of the most suitable fragments for the molecular
Camphor-10-sulfonic acid catalyzed condensation of 2-naphthol with aromatic/aliphatic aldehydes to 14-aryl/alkyl-14H-dibenzo[a,j]xanthenes
作者:Kshama Kundu、Sandip Nayak
DOI:10.2298/jsc130805021k
日期:——
(±)-Camphor-10-sulfonic acid (CSA) catalyzed condensation of 2-naphthol with both aliphatic/aromatic aldehydes at 80°C yielded 14-alkyl/aryl-dibenzoxanthenes as the sole product in high yields. However, the same condensation with benzaldehyde at 25°C afforded a mixture of intermediate 1,1-bis-(2-hydroxynaphthyl)phenylmethane and 14-phenyl-dibenzoxanthene while the condensation with aliphaticaldehydes at 25°C furnished
Recognition of steric factor in external association of xanthenocrown-5 and bis-napthalenocrown-6 with bis(benzimidazolium)propane borontetrafluoride
作者:Animesh Karmakar、Kshama Kundu、Sabari Ghosh、Chhanda Mukhopadhyay、Sandip K. Nayak、Tandrima Chaudhuri
DOI:10.1016/j.saa.2016.01.037
日期:2016.4
Carlo simulation established external association of small cavity crown with BBIM-propane dication axels. Resonance energy, binding constant and ratiometric detection of association of xanthenocrown-5 (1) and bis-napthalenocrown-6 (2) with bis-(benzimidazolium)propane borontetrafluoride (3a–3d) in acetonitrile determined the effect of stericfactor towards association.