AbstractA novel terpyridine-based complex CdL'S2 (L' = oxide of L; L = 10-hexyl-3-(2,6- di(pyridine-2-yl)pyridine-4-yl)-10H-phenothiazine) has been solvothermally synthesized and characterized by FT-IR spectroscopy, elemental analysis, 1H NMR andX-ray crystallography. The sulfur of phenothiazine moiety was oxidized when the crystal is formed. The complexC36H37CdN5O2S3 crystallizes in triclinic, space group Pīwith a = 9.4452(9), b = 13.0181(14), c = 14.6721(18) Å, α = 73.872(1), β = 81.531(1), γ = 87.547(2)°, V = 1714.2(3) Å3, Mr = 780.29, Dc =1.512 g·cm-3, μ = 0.861 mm-1, F(000) = 800, Z = 2, the final R = 0.0456 and wR = 0.1059for I > 2σ(I). The Cd(II) is coordinated bytwo terminal sulfur ionsand three pyridyl nitrogen atoms in a distorted trigonal bipyramidal geometry. Universal hydrogen bonds between the neighboring molecules have generated a supramolecular arrangement which contributes to the stability of the title complex. Fluorescence property and thermogravimetry of the complex have also been investigated and discussed.