01326nas a2200157   4500008004100000245013300041210006900174260000800243300001600251520069100267100002100958700002000979700002400999700001701023856012801040       2011                        eng d00aCompetitive binding of Ba2+and Sr2+ to 18-crown-6 in a receptor with a 1-methoxyanthraquinone analogue as the other binding site0 aCompetitive binding of Ba2and Sr2 to 18crown6 in a receptor with  cOCT  a4680–46903 a<p>Owing to their immense biological significance, development of sensors for the selective detection of alkaline earth metal ions has attracted vast research interest. In this article we have reported the synthesis, characterisation and ion binding studies of a new RuII-polypyridyl-crown-anthraquinone complex (5). Studies confirm selective binding of BaII, SrII and CaII ions, with Kmath image &gt; Kmath image &gt;&gt; Kmath image, over all other metal ions, to the crown ether moiety and not to the methoxy anthraquinone component, the latter being the second binding site available and known for its affinity towards alkaline earth metal ions from one of our previous reports.</p>1 aBanerjee, Tanmay1 aSuresh, Moorthy1 aGhosh, Hirendra, N.1 aDas, Amitava  uhttps://library.ncl.res.in/content/competitive-binding-ba2and-sr2-18-crown-6-receptor-1-methoxyanthraquinone-analogue-other02663nas a2200193   4500008004100000022001400041245013100055210006900186260007100255300001600326490000800342520188900350100001802239700002002257700002102277700001702298700002402315856013002339       2016                        eng d  a1932-744700aCharge delocalization in the cascade band structure CdS/CdSe and CdS/CdTe core-shell sensitized with Re(I)-polypyridyl complex0 aCharge delocalization in the cascade band structure CdSCdSe and   a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY  a10051-100610 v1203 a<p>Charge-carrier dynamics of CdS quantum dot (QD) and CdS/CdSe type-I and CdS/CdTe type-II core shell nanocrystals (NCs) sensitized with a Re(I)-polypyridyl complex have been carried with special emphasis on studies on carrier delocalization and the role of Re-complex as a hole acceptor and sensitizer molecule. Our investigation confirmed photoexcited hole transfer from CdS and CdS/CdSe to the Re-complex, while no hole transfer was observed in the CdS/CdTe Re-complex system. This was rationalized by the evaluation of the relative energy levels, which revealed that such hole migration was not energetically favorable due to low-lying highest occupied molecular orbital (HOMO) of the Re-complex as compared with the valence band (VB) of CdTe shell; however, luminescence quenching from upper excited states of Re-complex was observed in the presence of all three QD and core shell systems, which has been attributed to electron injection from hot state (energetically higher than the LUMO state) of the Re-complex to the conduction band (CB) of the QDs. Transient absorption (lambda(pump) = 400 nm, lambda(probe) = 450-750 nm) spectra recorded for Re complex-sensitized CdS and CdS/CdSe composite in the femtosecond time domain revealed a broad transient absorption band in the 580-750 nm region with a peak around 595 nm, and this was attributed to the cation radical formation for Re-complex, either by capturing photoexcited hole from the NCs or by injecting electron to the CB of the NCs. As anticipated, no such spectrum was observed for the CdS/CdTe Re-complex composite system after 400 nm excitation. Electron injection from photoexcited Re-complex to CdS QD and CdS/CdSe core shell was found to be &lt;100 fs, while the hole transfer from photoexcited CdS QD and CdS/CdSe core shell to Re-complex took place within the time scale of 900 fs and 2.5 ps, respectively.</p>1 aMaity, Partha1 aDebnath, Tushar1 aBanerjee, Tanmay1 aDas, Amitava1 aGhosh, Hirendra, N.  uhttps://library.ncl.res.in/content/charge-delocalization-cascade-band-structure-cdscdse-and-cdscdte-core-shell-sensitized-rei