Related Experiment Video
Updated: May 9, 2026
07:44
Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
Published on: July 6, 2016
A pentaquinone based probe for relay recognition of F- and Cu2+ ions: sequential logic operations at the molecular
Vandana Bhalla1, Roopa, Manoj Kumar
1Department of Chemistry, UGC Sponsored-Centre for Advanced Studies-I, Guru Nanak Dev University, Amritsar-143005, Punjab, India. vanmanan@yahoo.co.in
Dalton Transactions (Cambridge, England : 2003)
|July 27, 2013
Abstract:
A pentaquinone based compound (2a) has been synthesized, which can selectively sense F(-) ions via fluorescence quenching, while the in situ generated deprotonated species of 2a can recognize Cu(2+) ions via a fluorescence enhancement. Derivative 2a can also behave as a sequential logic circuit with chemical inputs from F(-) and Cu(2+) ions.
Related Concept Videos
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.