title: Greener Route for Synthesis of aryl and alkyl-14H-dibenzo [a.j] xanthenes using Graphene Oxide-Copper Ferrite Nanocomposite as a Recyclable Heterogeneous Catalyst.
abstract: A facile, efficient and environmentally-friendly protocol for the synthesis of xanthenes by graphene oxide based nanocomposite (GO-CuFe2O4) has been developed by one-pot condensation route. The nanocomposite was designed by decorating copper ferrite nanoparticles on graphene oxide (GO) surface via a solution combustion route without the use of template. The as-synthesized GO-CuFe2O4composite was comprehensively characterized by XRD, FTIR, Raman, SEM, EDX, HRTEM with EDS mapping, XPS, N2adsorption-desorption and ICP-OES techniques. This nanocomposite was then used in an operationally simple, cost effective, efficient and environmentally benign synthesis of 14H-dibenzo xanthene under solvent free condition. The present approach offers several advantages such as short reaction times, high yields, easy purification, a cleaner reaction, ease of recovery and reusability of the catalyst by a magnetic field. Based upon various controlled reaction results, a possible mechanism for xanthene synthesis over GO-CuFe2O4catalyst was proposed. The superior catalytic activity of the GO-CuFe2O4nanocomposite can be attributed to the synergistic interaction between GO and CuFe2O4nanoparticles, high surface area and presence of small sized CuFe2O4NPs. This versatile GO-CuFe2O4nanocomposite synthesized via combustion method holds great promise for applications in wide range of industrially important catalytic reactions.
authors.affiliation: Department of Chemistry, National Institute of Technology, Rourkela, Odisha, 769008, India.
authors.forename: Aniket
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, National Institute of Technology, Rourkela, Odisha, 769008, India.
authors.forename: Lipeeka
authors.initials: L
authors.lastname: Rout
authors.affiliation: Department of Chemistry, National Institute of Technology, Rourkela, Odisha, 769008, India.
authors.forename: Lakkoji Satish Kumar
authors.initials: LS
authors.lastname: Achary
authors.affiliation: Novel Materials and Interface Physics Laboratory, Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India.
authors.forename: Rajendra S
authors.initials: RS
authors.lastname: Dhaka
authors.affiliation: Department of Chemistry, National Institute of Technology, Rourkela, Odisha, 769008, India.
authors.forename: Priyabrat
authors.initials: P
authors.lastname: Dash