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The First Example of Bisindole‐Based Polyurethane Dendrimers: Synthesis and Performance in DSSC
Author(s) -
Sathiyaraj Subramaniyan,
Kumar Kaliamurthy Ashok,
Jailani Shanavas Abdul Kadar,
Sultan Nasar Abdul Salam
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701160
Subject(s) - dendrimer , isocyanate , moiety , dye sensitized solar cell , polyurethane , amine gas treating , polymer chemistry , proton nmr , materials science , molecule , chemistry , nuclear magnetic resonance spectroscopy , organic chemistry , electrolyte , electrode
A new B 3 ‐type blocked isocyanate core and AB 2 ‐type building block molecules containing bis‐indole moiety were synthesized via a scalable synthetic routes. Starting with these molecules, amine‐ and blocked isocyanate‐terminated polyurethane dendrimers up to third generation were build‐up using (i) a simple urethane interchange reaction, (ii) deprotection of amine and (iii) efficient conversion of amine into blocked isocyanate groups. The structural integrity of the core, building block and their intermediates were verified using FT‐IR, 1 H‐NMR, and 13 C‐NMR spectroscopy and HR‐MS technique. The structure and molecular weight of blocked isocyanate‐terminated dendrimers were confirmed using 1 H‐NMR spectra and size exclusion chromatography with multi angle laser light scattering detector (SEC‐MALLS) technique respectively whereas the structure of all other dendrimers were confirmed using FT‐IR, 1 H‐NMR, and 13 C‐NMR spectroscopy. Dye‐sensitized solar cells (DSSC) were fabricated using these dendrimers as electrolytes; the DSSC fabricated with G3 dendrimer yielded an overall energy conversion efficiency (η) of 6.32 % upon illumination with 1 sun visible light.