title: Synthesis of pyrazolylbisindoles over mesoporous Lewis acidic ZrTUD-1: Potential application in selective Cu(2+) colorimetric detection.
abstract: A series of pyrazolylbisindole (PBI) derivatives were prepared by simple condensation of indole and pyrazole aldehyde utilizing amorphous mesoporous ZrTUD-1 having predominant Lewis acid sites. The applicability of pyrazolylbisindolyl derivate as a colorimetric chemosensor with high selectivity toward Cu(2+) over other cations were tested. Among heavy and transition metal (HTM) ions in CH3CN solution, the probe only sensed Cu(2+) detectable by naked eye. The sensor exhibited a new absorption band at 488 nm (a red shift of 206 nm from 282 nm) with a large colorimetric response and affinity to Cu(2+) over other cations tested (Al(3+), Pb(2+), Cd(2+), Mg(2+), Mn(2+), Zn(2+), K(+), Fe(2+), Ca(2+), Cu(2+) and Hg(2+)).
authors.affiliation: Department of Chemistry, University College of Engineering Tindivanam (a Constituent College of Anna University Chennai), Melpakkam 604001, India.
authors.forename: Karthikeyan
authors.initials: K
authors.lastname: Kandasamy
authors.affiliation: Department of Chemistry, University College of Engineering Tindivanam (a Constituent College of Anna University Chennai), Melpakkam 604001, India. Electronic address: sibi.gb@gmail.com.
authors.forename: Sivaprasad
authors.initials: S
authors.lastname: Ganesabaskaran
authors.affiliation: Department of Chemistry, Anna University, Chennai 600025, India.
authors.forename: Muthusamy Poomalai
authors.initials: MP
authors.lastname: Pachamuthu
authors.affiliation: Department of Chemistry, Anna University, Chennai 600025, India.
authors.forename: Rajamanickam
authors.initials: R
authors.lastname: Maheswari
authors.affiliation: Center for Environmentally Beneficial Catalysis (CEBC), The University of Kansas, Lawrence, KS 66047, USA. Electronic address: anand@ku.edu.
authors.forename: Anand
authors.initials: A
authors.lastname: Ramanathan
mesh_terms: D002413:Cations, Divalent / Q000032:analysis; D003124:Colorimetry / Q000379:methods; D003300:Copper / Q000032:analysis*; D007211:Indoles / Q000138:chemical synthesis / Q000737:chemistry*; D058116:Lewis Acids / Q000737:chemistry*; D016062:Porosity; D011720:Pyrazoles / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D002413:Cations, Divalent; D007211:Indoles; D058116:Lewis Acids; D011720:Pyrazoles; D003300:Copper
keywords: Colorimetric chemosensor; Copper; Pyrazolylbisindoles; TUD-1; Zirconium