Browsing by Subject "Metal ions."

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Open Access
Cascading logic gates using ion signals generated by photolabile caged compounds
(2013) Atılgan, Ahmet
Caged compounds have attracted great attention due to their use in the elucidation of numerous biochemical processes. Photolabile caged compounds release covalently bound moieties upon exposure of ultraviolet light. Releasing the active species in such a controlled manner enables concentration of the molecules to be manipulated in spatiotemporal way. Getting inspired from the knowledge of cellular information transfer through second messenger systems which Ca and Zn ions play important role, we synthesized a photolabile caged Zn(II) compound so that we benefit from its controlled ion release feature, so as to integrate two molecular logic gates physically. For that reason, a molecular logic operation was designed and the released ion was used as information carrier from one logic gate to other. After proving its practicality, we tested same principle for higher molecular logic systems. To do that, photolabile caged Zn(II) compound and previously proved supermolecule with coupled AND logic gates were physically integrated. Results proved that photolabile caged Zn(II) compounds is a useful way to combine two separate logic gates by means of free zinc ions. From this point of view, the approach physical integration of molecular logic gates through a metal ion or compound might be a solution for building more complex molecular logic systems.
Open Access
Selective manipulation of ICT and PeT processes in styryl-Bodipy derivatives : applications in molecular logic and fluoerescence sensing of metal ions
(2010) Selçuk, Sencer
Recent developments in the Bodipy chemistry, provided new opportunities for modification of this chromophore which, in turn, using appropriate metal-ligand pairs, allowed the control and manipulation of PeT and ICT mechanisms. Exploiting these mechanisms, we demonstrated that photophysical properties of Bodipy can be shaped as desired using metal cation modulators to obtain absorbance signals in accordance with a digital half-adder circuit. In addition, another Bodipy derivative with a simple and rational design, shown to have emission signals equivalent to AND operation in Boolean logic. A molecular threeinput AND gate was also synthesized taking the advantage of differential binding affinities of metal cations for different ligands. Our work proves that, with careful design, photophysical properties of a single chromophore can be modified as desired. Hence molecular logic gates, and even molecules performing more complex logic operations can be obtained using metal cations as non-annihilating logic inputs.
Open Access
Synthesis and characterization of novel ion sensor based on 2, 6-functionalized BODIPY structure
(2012) Uyar, Taha Bilal
Latest developments in chemistry of BODIPY make available synthesis of novel BODIPY based fluorescent chemosensors. Therefore, the design of novel chemosensors is attracting great attention in recent years. In this study, we functionalized 2 and 6 positions of BODIPY choromophore to understand that binding of different metal ions how affect the absorption and emission spectrums of BODIPY. We used three metal ions which are important in environment and biological systems and these are Hg (II), Zn (II) and Ca ions. Binding of these metal ions to azo crown ether is which attached BODIPY caused large changes in absorption and emission spectrums according to photoinduced electron transfer (PET) and internal charge transfer (ICT) mechanism.