New PDF release: Advances in Supramolecular Chemistry, Volume 4 (Advances in

January 31, 2018 | Inorganic | By admin | 0 Comments

By G.W. Gokel

ISBN-10: 0080550894

ISBN-13: 9780080550893

ISBN-10: 1559387947

ISBN-13: 9781559387941

A part of a sequence which provides experiences of efforts in all components of supramolecular technology, this quantity discusses numerous subject matters within the box.

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Extra info for Advances in Supramolecular Chemistry, Volume 4 (Advances in Supramolecular Chemistry)

Example text

Besides this aesthetic factor, off-on systems and especially the aminoalkyl aromatic family tend to be synthetically more accessible since amine synthons are available in great variety. 18 A. PRASANNA DE SILVA ETAL. Figure 2. (a) Schematic representation of the three-module format of an ionically switchable photoactive dyad (reverse logic). For a given lumophore, the receptors required here are more electron deficient than those used in Figure 1. We have tried to symbolize this with grey shading in the present case.

LU M O PH O RE-R ECEPTOR 1-S PAC ER-R ECEPTO R2 SYSTEMS Almost all the examples discussed so far use covalent bonds to hold the receptor at a reasonable distance from the lumophore. However, alternative strategies are available. For instance, receptor 2 selective for the guest ion of interest may be covalently linked to another receptor~ which is chosen for its ability to selectively bind a lumophore. This approach has the reward of versatility. Once synthesized, the receptorl-spacer-receptor 2 system may be combined with any one of several different lumophores with a range of optical properties.

The long emission lifetime is of special interest to industrialists since sensors based on lifetime (rather than on emission intensity) can be constructed with low-cost, modulated light-emitting diodes (LEDs). Lifetime sensing of ions, so far only available for fluorescence 66'67 where LED modulation is not feasible, carries an internal reference for self-calibration (unlike simple intensity sensing) which makes them immune to microenvironmental variations in optical path, sensor incorporation, and quencher concentration.

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Advances in Supramolecular Chemistry, Volume 4 (Advances in Supramolecular Chemistry) by G.W. Gokel

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