A new discrete bis-dithiolene complex, [ PPh4]2[Zn(DMED)2] (1; DMED = 1,2-dicarbomethoxy-1,2-dithiolate) with sulfurbased radical character was synthesized and structurally characterized. Complex 1 is stable and exhibits a square planar geometry around the zinc metal. 1 forms nanospheres through a one-pot water-induced self-assembly in a mixture of solvents (acetonitrile–water). These nanospheres were further decorated with water-soluble carbon nanotubes (wsCNTs) through hydrogen bonding between the peripheral –COOCH3 groups of 1 and surfacial carboxyl groups of wsCNTs to assemble into a spherical nanocomposite. The as-prepared nanocomposite showed fluorescence emissions in visible region due to the separation of energy states of the nanospheres assisted by wsCNTs, suggesting the future possibilities of these new materials for use in biomedical application.

Fluorescent microspheres of zinc 1,2-dicarbomethoxy-1,2-dithiolate complex decorated with carbon nanotubes
    Abstract
    1 Introduction
    2 Experimental section
        2.1 Materials
        2.2 Synthesis
            2.2.1 Synthesis of zinc(II) polysulfide: [PPh4]2[Zn(S4)2]
            2.2.2 Synthesis of zinc(II)1,2-dicarbomethoxy-1,2-dithiolate: [PPh4]2[Zn(DMED)2]
            2.2.3 Synthesis of wsCNTs
        2.3 Instrumentation
    3 Results and discussion
        3.1 Characterization of wsCNTs
        3.2 Characterization of zinc(II) 1,2-dicarbomethoxy-1,2-dithiolate
            3.2.1 Electronic spectral and FTIR measurements
            3.2.2 EPR measurements
        3.3 Self-assembly of 1 with water
        3.4 Nanocomposites of 1 and wsCNTs
        3.5 Fluorescence
    4 Conclusions
    Acknowledgements 
    References

• Gouri Sankar Das(Department of Bionanotechnology, Gachon University)
• Sabyasachi Sarkar(Department of Chemistry, Indian Institute of Engineering Science and Technology)
• Ruchi Aggarwal(Department of Chemistry, Malaviya National Institute of Technology)
• Sumit Kumar Sonkar(Department of Chemistry, Malaviya National Institute of Technology)
• Jun‑Woo Park(Next Generation Battery Research Center, Korea Electrotechnology Research Institute)
• Kumud Malika Tripathi(Department of Bionanotechnology, Gachon University)
• TaeYoung Kim(Department of Bionanotechnology, Gachon University/Department of Materials Science and Engineering, Gachon University)