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pH Dependent Self‐Assembly of Single‐Pyrene‐Armed Calix[4]arene: Modulation and Complexation with p ‐Sulfonatocalix[6]arene
Author(s) -
Kalyani Vrashali S.,
Gawhale Sharadchandra T.,
Rathod Nilesh V.,
Singh Prabhat K.,
Malkhede Dipalee D.
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201902363
Subject(s) - calixarene , pyrene , chemistry , stacking , dimer , derivative (finance) , fluorescence , molecule , excimer , crystallography , photochemistry , stereochemistry , organic chemistry , physics , quantum mechanics , financial economics , economics
The photophysical behaviour of a single pyrene substituted calix[4]arene derivative (MPCX4) has been investigated, as a function of pH, using steady state fluorescence and time‐resolved emission spectroscopic techniques. An interesting dimer emission band has been observed exclusively in the alkaline solution (pH > 8) which has been attributed to the hydrophobic and stacking interaction between the pyrene moieties of the adjacent MPCX4 molecule. The self‐assembled MPCX4 is disrupted by the introduction of another calixarene based host, p ‐sulfonatocalix[6]arene (SCX6), which eventually leads to the 1:1 complex formation between MPCX4 and SCX6, which is further characterised by 1 H NMR, FT‐IR and HR‐MS techniques. This complexation between MPCX4 and SCX6 also leads to the modulation of the prototropic equilibrium of MPCX4.