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1H NMR Spectral Evidence for a Specific Host−Guest Complexation Induced Charge Localization in Squaraine Dyes

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journal contribution
posted on 2005-07-21, 00:00 authored by Ayyappanpillai Ajayaghosh, Easwaran Arunkumar
Experimental support is provided for the charge localization in squaraines, a class of fundamentally and technologically important organic dyes, by 1H NMR analysis through a host−guest complexation approach. Specific binding of Ca2+ ions to the squaraine 2 with a podand sidearm resulted in a charge-localized structure 2a with dramatic shifts and resolution of the proton signals when compared to those of 2.

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