Synthesis of Nanocrystalline ZnS from (1,10-phenanthroline)bis(1,2,3,4-tetrahydroquinolinecarbodithioato-S,S′)zinc(II)

Abstract

(1,10-Phenanthroline)bis(1,2,3,4-tetrahydroquinolinecarbodit hioato-S,S′)zinc(II) (1) was synthesized and characterized by FT-IR and NMR spectroscopy. A single-crystal X-ray structural analysis was carried out for (1,10-phenanthroline)bis(1,2,3,4-tetrahydroquinolinecarbodithioato-S,S′)zinc(II)·trithiocarbonic acid. The downfield shift of N¹³CS₂ carbon signal for 1 (209.4 ppm) from chemical shift value of parent complex [Zn(thqdtc)₂] (2) (205.7 ppm) (thqdtc = 1,2,3,4-tetrahydroquino linecarbodithioate) is attributed to the increase in coordination number. Single crystal X-ray structure of [Zn(thqdtc)₂(1,10-phen)].ttc (ttc = trithiocarbonic acid) indicate that the central metal atom is in distorted octahedral environment. The compound (1) has been found to be an effective single-source precursor for the preparations of ZnS nanoparticles via solvothermal method. TEM image of ZnS nanoparticles shows that most of the as-prepared particles are nanosheets while the reminder are nanorods. The UV-vis absorption spectrum of ZnS nanoparticles exhibits a blue shift with respect to that of the bulk sample, which is attributed to the quantum size effects. The strong emission peak centered at 434 nm in fluorescence spectrum could be attributed to the electron-hole recombination from internal vacancies for Zn and S atoms.

Keywords:

• heterocyclic dithiocarbamate
• nitrogen donor
• optical properties
• PXRD
• TEM
• ZnS nanoparticles