Transesterification Activity by a Zinc(II)-Schiff Base Complex with Theoretical Interpretation

Publication date: Available online 19 February 2020Source: Inorganica Chimica ActaAuthor(s): Chanchal Kumar Pal, Shreya Mahato, Mayank Joshi, Suvendu Paul, Angshuman Roy Choudhury, Bhaskar BiswasAbstractThe article demonstrates the synthesis, structural characterization and transesterification activity of a mononuclear zinc(II) complex, [Zn(HL)(H2O)].(H2O) (1) containing a previously reported Schiff base ligand, H3L = N,N′-bis(salicylidene)-1,3-diamino-2-propanol]. X-ray structural analysis of 1 reveals that Zn(II)-Schiff base complex crystallizes in hexagonal crystal system with P61 space group and adopts a distorted tetrapyramidal geometry. Self-assembled molecular units of 1 exhibit a beautiful construction of 3D crystalline architecture through intermolecular hydrogen bond wire. Zinc(II) complex displays an enhancement of fluorescence intensity in comparison to HL in methanol medium. Catalytic behaviour of 1 towards disodium salt of 2,4-dinitrophenylphosphate (PNPP) in aqueous-methanol medium exhibits good transesterification activity with initial rate constant value of 1.73×10-4 min-1. Detailed DFT calculations are also employed to cope with the geometrical parameters of 1 as well as to explore the proposed catalytic mechanism of transesterification activity.Graphical abstractThe present study accounts on the synthesis, structural characterization, self-assembled crystalline architecture, and transesterification study of a mononuclear zinc(II) complex, [Zn(HL)(H2O)].(...
Source: Inorganica Chimica Acta - Category: Chemistry Source Type: research