Synthesis, characterization of one Cr (III) complex: An efficient chemosensor for Cr (III) ions and designing of a molecular logic gate

A simple spectrophotometric based method for the detection of both the trivalent and hexa valent forms of chromium using 3-amino-2-pyrazine carboxylic acid (APC) is reported. Using APC as a ligand with Cr(NO3)(3)center dot 6H(2)O a new mononuclear complex has also been synthesized and systematically characterized by elemental analysis and IR studies. Single crystal X-ray diffraction analysis reveals octahedral-type geometry with N3O3 coordination environments from the ligand. The optical sensing properties of APC for metal ions were enlightened by UV-Vis study. This sensor displays high selectivity and sensitivity towards Cr3+ in methanol. Interestingly the ligand displayed enhancement due to chelation with Cr(3+)and quenching while interacting with Cr6+ ions. Complete opposite spectroscopic behavior helps us to identify the oxidation state of chromium. The logical response of the molecular AND gate is realized and as the APC can efficiently sense Cr3+ in solitary as well as crowded conditions, presence of M+n ions would not have any effect to the logic functioning of the molecular AND gate. (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

A simple spectrophotometric method for detecting both trivalent and hexavalent forms of chromium using 3-amino-2-pyrazine carboxylic acid (APC) is reported. A new mononuclear complex has been synthesized and characterized by elemental analysis and IR studies. The optical sensing properties of APC for metal ions, particularly Cr3+, have been investigated.