A thiacalix[4]crown based chemosensor for Zn²⁺ and H₂PO₄⁻: sequential logic operations at the molecular level.
A thiacalix[4]crown based di-topic receptor 3 possessing two types of binding sites viz. crown-5 ring and imino moieties has been synthesized which undergoes fluorescence enhancement in the presence of Zn(2+) ions. The selective binding of Zn(2+) to compound 3 does not allow the K(+) ions to bind with the crown-5 ring and thus a negative allosteric behaviour has been observed between Zn(2+)/K(+) ions. In addition, the 3-Zn(2+) complex can be used for the detection of H2PO4(-) ions with a fluorescence "turn-off" response. Furthermore, based on the fluorescence response, a two input and one output sequential logic circuit has been constructed.
Department of Chemistry, UGC Sponsored Centre for Advance Studies-1, Guru Nanak Dev University, Amritsar, Punjab, India. mksharmaa@yahoo.co.in.
Neetu
N
Sharma
Shahi Imam
SI
Reja
Vandana
V
Bhalla
Manoj
M
Kumar
D000494:Allosteric Regulation; D047248:Crown Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry; D007097:Imines / Q000737:chemistry; D015394:Molecular Structure; D010756:Phosphoric Acids / Q000032:analysis* / Q000737:chemistry; D011188:Potassium / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D015032:Zinc / Q000032:analysis* / Q000737:chemistry
D047248:Crown Compounds; D005456:Fluorescent Dyes; D007097:Imines; D010756:Phosphoric Acids; D015032:Zinc; D011188:Potassium