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Volumn 14, Issue 32, 2008, Pages 10101-10114

Squaraines as reporter units: Insights into their photophysics, protonation, and metal-ion coordination behaviour

Author keywords

Dyes pigments; Fluorescence; Metal ions; Protonation; Squaraines

Indexed keywords

ANILINE; ANILINE DERIVATIVE; CYCLOBUTANE DERIVATIVE; DYES, REAGENTS, INDICATORS, MARKERS AND BUFFERS; PHENOL DERIVATIVE; PROTON; SQUARAINE;

EID: 55449125156     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.200800300     Document Type: Article
Times cited : (66)

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    • Although most of the reported logic gates operate with two different inputs (e.g, two metal ions) the use of different concentrations of a single metal ion (for instance, Hg2+ in this case) can also give logic truth tables when using squaraine derivatives, such as those we report here containing different binding sites and different colours depending on the number and position of the coordinated metal ions. We would like to point out that in these systems the A, 1/B, 0 and the A=0/B, 1 cases are not intrinsically identical as we can imagine a system in which two different injectors can feed in an input (a Hg2+ solution of a certain concentration) to a vessel containing the squaraine SNS2O2. Such a disposition will develop a logic truth table such as that shown in Table 10
    • 2. Such a disposition will develop a logic truth table such as that shown in Table 10.
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    • In acetonitrile/water 20:80 v/v, SNS2O2 forms H-aggregates, the presence of which can be controlled by the choice of the acetonitrile:water ratio. For a more detailed description of the system, see reference [15
    • 2 forms H-aggregates, the presence of which can be controlled by the choice of the acetonitrile:water ratio. For a more detailed description of the system, see reference [15].
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    • Note that for all the compounds analysed here, the HOMO-LUMO contributes >65% to the lowest-energy allowed transition as derived from ZINDO calculations performed on the optimised B3LYP geometries (ZINDO/S with single configuration interaction (SCI) involving singly excited configurations generated from all occupied and unoccupied d-type molecular orbitals).
    • Note that for all the compounds analysed here, the HOMO-LUMO contributes >65% to the lowest-energy allowed transition as derived from ZINDO calculations performed on the optimised B3LYP geometries (ZINDO/S with single configuration interaction (SCI) involving singly excited configurations generated from all occupied and unoccupied d-type molecular orbitals).


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