The (C7H12N2)(2)[SnCl6]Cl-2 center dot 1.5H(2)O compound was characterized by X-ray powder diffraction study to confirm the crystalline nature. The Hirshfeld surface analysis was carried out to discuss the strength and role of the hydrogen bonds and other intermolecular contacts in crystal lattice. The crystal structures, vibrational frequencies, atomic charges and the related properties were also investigated by the density functional theory (DFT) method. The HOMO-LUMO energy shows high band gap energy indicative of stability of the synthesized compound. Interestingly, the synthesized product shows a higher antioxidant activity in a dose-dependent manner evaluated through different in vitro antioxidant assays and an interesting antibacterial activity.