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Using ethylenediamine (en) as a structure-directing agent, a novel hybrid decavanadate (diethylenediammonium diammonium decavanadate tetrahydrated) (NH 4) 2 (H 2 en) 2 {V 10 O 28 }.4H 2 O has been synthesized via a slow evaporation approach. A low-temperature single-crystal X-ray diffraction investigation was used to investigate its structural structure. Its crystal structure was studied using a low-temperature single-crystal X-ray diffraction analysis showing a crystallization in the triclinic system (S.G. P-1) with the following unit cell parameters (Å, °) a = 8.4975 (2), b = 10.2550 (3), c = 10.9165 (3), α = 103.950 (2), β = 98.466 (2), γ = 113.978 (3). The asymmetric unit is made up of a single [V 10 O 28 ]6- monomer, one (NH 4)+, one ethylenediammonium (H 2 en)2+ cation, and two H 2 O molecules. Supramolecular interactions such as N─H···O and O─H···O hydrogen bonds build the three-dimensional network, ensuring the connection between organic cations, water molecules, and the inorganic framework. The Fourier Transform Infrared result shows distinct bands associated with decavanadate moieties, organic molecules, water molecules and ammonia and it was correlated with the crystal structure. The organic moieties, water molecules, and ammonium ions are all lost during the hybrid compound's thermal decomposition. The study of the corrosion inhibiting behavior of the decavanadate solution clearly showed a much stronger effect in acidic media than in a neutral environment. However, the biological activity of (NH 4) 2 (H 2 en) 2 {V 10 O 28 }.4H 2 O revealed humble results. • A new decavanadate (H 2 en) 2 (NH 4) 2 {V 10 O 28 }.4H 2 O is chemically crystallized by controlling pH. • The crystals are stable under 100 °C. • Decavanadate solution has strong inhibiting power against corrosion in 1 M HCl, whereas it has no effect in 3% NaCl. • (H 2 en) 2 (NH 4) 2 {V 10 O 28 }.4H 2 O displays low antimicrobial and antioxidant activities. [ABSTRACT FROM AUTHOR]