Abstract:　New　optical　coordinated　complexes　CuxNi1 – x(C2H6N2O)6SO4　(x　=　0.31,　0.49,　0.66)　were　synthesized　and　the　single　crystal　Cu0.66Ni0.34(C2H6N2O)6SO4　(I)　was　selected　for　characterization.　FT-IR　and　Raman　spectroscopic　studies　were　carried　out　to　identify　the　various　functional　groups　present　in　crystal.　The　crystal　structure　I　was　established　by　single　crystal　X-ray　diffraction　(XRD)　technique　(CIF　file　CCDC　no. 2068488)　and　the　complex　belongs　to　trigonal　system,　(Formula　presented.)　space　group.　TGA–DTA　measurements　showed　complex　I　remains　stable　until　about　180°C.　UV−Vis　spectrum　of　complex　I　exhibited　three　absorption　bands　in　ultraviolet,　visible　and　near-infrared　region,　respectively,　which　was　attributed　to　d–d,　L–M　and　π–π*　transitions　absorption.　Moreover,　the　absorption　peaks　of　I　have　a　distinct　bathochromic　shift　(20 nm)　compared　with　M(H2O)62+　units　(M　=　Ni,　Cu).　The　photophysical　properties　allow　it　to　selectively　filter　yellow-green　and　blue-violet　light.　©　2022,　Pleiades　Publishing,　Ltd.