A novel Ru(III) and Fe(III) complexes of ligands 1 and/or 2 {where 1 = 2,2 '-((1E, 1'E)-((azanediyIbis(ethane-2,1-diyl))bis(azanylylidene))bis(methanylylidene))diphenol and 2 = 2,2'-((1E, 1'E)-((azanediylbis(ethane-2,1-diyl))bis(azanylylidene))bis(methanylylidene)) bis(4-nitrophenol)} have been synthesized as 'neat' and zeolite Y encapsulated complexes. These catalysts are characterized by various analytical tools such as FTIR, UV-vis, elemental analysis, ICP-AES, molar conductivity, H-1- and C-13 NMR, TGA, SEM, AAS, BET, magnetic susceptibility and powder XRD to endorse the complex formation, absence of peripheral redundant ligands and complexes, conservation of zeolite Y morphology and crystallinity, and the encapsulation of complexes without devastation in the zeolite Y framework. Out of these synthesized catalysts, 5Y is found to be a potent candidate for styrene (Conv. 76.1%, TOF: 2130h(-1)), cyclohexene (Cony. 84.4%, TOF: 2351 h(-1)), limonene (Cony. 81.6%, TOF: 2273 h(-1)), and a-pinene (Cony. 72.6%, TOF: 2023 h(-1)) oxidation with high selectivity of respective allylic products excluding the styrene oxidation, which undergoes epoxidation only. The addition of H2SO4 in an identical reaction catalyzed by 5Y not only surge the conversion up to 100% in a short time span with high TOF but also increase the selectivity of respective epoxidation products. This switchover in the selectivities could be credited to the presence of H2SO4 that facilitates the heterolytic -O-O- bond cleavage of metal hydroperoxide and stimulates the epoxidation over allylic oxidation. Furthermore, the results establish that the heterogeneous systems are effortlessly recovered and reused without ample drop in the activity and selectivity. (C) 2016 Elsevier B.V. All rights reserved.