The hybrid material AlCo2P3O4.1/2H2O: DIMPPZ (AlCoP-DIMPPZ; 1,4-dimethyl piperazine: DIMPPZ) was elaborated by hydrothermal synthesis. The X-ray diffraction indicates a single-phase crystallizing in a rhombohedral symmetry (S.G: \(R\overline{3 }\) ) isotype with ACP-CHA9 (C4) AlCo2P3O4.1/2H2O with the lattice constants: a = 1.3549(4) and c = 1.5279(5) nm. The optical study revealed a direct electronic transition at 1.82 eV, assigned to the crystal field splitting of the low spin Co2+: 3d7 in tetrahedral coordination. A further transition indirectly allowed occurs at 1.77 eV. The FT-IR spectrum confirms the existence of (PO4)3−, Co–O, organic matter and OH groups. The thermal analysis (TGA/DSC) shows that the as-prepared material enclosed water and organic molecules. The room temperature conductivity measured on pellet sintered at 200 °C (σ300K = 4.45 × 10–6 Ω−1 cm−1) is characteristic of a non-degenerate semiconductor; an electron mobility of ~ 1.29 × 10–4 cm2 V−1 s−1 was calculated. The gap energy (Eg), reflection index (n), extinction coefficient (k), dielectric complex (ɛ), optical conductivity (σopt), dissipation factor (tan δ) and relaxation time (τ) were determined. Through this study, it shows a decrease in magnitudes (n, k ɛ, σopt, σelec, tan δ and τ) while the absorption coefficient shows an increase with increasing in energy. This material presents two optical transitions made it a good optoelectronic material. Additionally, the high reflective index shows that it can also be used as high index product.
