SYNTHESIS, CRYSTAL STRUCTURE, OPTICAL AND ANTIMICROBIAL PROPERTIES OF 2-NITROBENZYL TRIPHENYLPHOSPHONIUM TETRABROMOCOBALTATE(II)

A novel organic-inorganic hybrid multifunctional crystalline material, 2-nitrobenzyl triphenylphosphonium tetrabromocobaltate(II) [2-NO2BzTPP]2[CoBr4](1), has been synthesized using [2-NO2BzTPP]Br and CoBr2 in methanol solution acidified with hydrobromic acid and characterized using single-crystal X-ray diffraction and spectroscopic techniques. The single-crystal X-ray diffraction analysis showed that the hybrid [2-NO2BzTPP]2[CoBr4](1) belongs to the triclinic space group P–1 with a = 11.1815(17) Å, b = 12.954(2) Å, c = 19.426(3) Å, α = 99.312(5)°, β = 100.654(5)°, γ = 113.746(5)°, V = 2442.3(7) Å3, Z = 2, which consists of two [2-NO2BzTPP]+ cations and a [CoBr4]2– anion. The Co(II) ion in the [CoBr4]2– anion is coordinated to four Br– ions and has a tetrahedral geometry. The C–H···O hydrogen bonds, O···π and O···Br interactions in the crystal can favor crystal stacking and stabilization. The bulk phase purity, homogeneity, and morphology of the desired compound are checked using powder XRD, and SEM-EDX analysis. The hybrid crystal showed an emission peak near 468 nm at room temperature under the excitation of UV light at 241 nm. The low energy gap (2.85 eV) indicated that the crystal was a semiconductor suitable for optical applications. Furthermore, the compound exhibited good bactericidal activity against E. coli and S. aureus.