A　novel　complex,　[Co0.5Ni0.5(C6H12N4)(2)(H2O)(4)](2)[Co0.5Ni0.5(H2O)(6)](2)[SO4](4)center　dot　13H(2)O,　has　been　prepared　and　its　hexagonal　crystal　was　obtained　from　aqueous　solution　by　solvent　evaporation　method.　Single　crystal　X-ray　diffraction　revealed　that　the　complex　crystallizes　in　triclinic　system,　space　group　P-1　with　lattice　parameters　a　=　9.2268(7)　angstrom,　b　=　13.3529(9)　angstrom,　c　=　15.9211(11)　angstrom　and　interfacial　angles　alpha　=　66.246(3)degrees,　beta　=　89.193(3)degrees,　gamma　=　89.303(3)degrees.　The　coordination　geometry　around　the　metal　ion　is　described　as　distorted　octahedron　in　which　the　two　hexamethylenetetramine　molecules　occupy　two　apical　sites.　TGA　revealed　three　main　mass　loss　steps　at　about　71　degrees　C,　219　and　475　degrees　C,　which　represents　the　temperature　of　dehydration,　skeleton　decomposition　and　sulfate　decomposition,　respectively.　Further,　the　UV-VIS　spectra　showed　an　intense　transmission　around　293　nm　and　strong　absorption　in　visible　region,　indicating　the　application　potential　as　ultraviolet　light　filters　(ULFs).　Variable-temperature　magnetic　measurements　were　carried　out　for　the　complex,　which　was　found　to　obey　the　Curie-Weiss　law　with　C-m　=　8.475　cm(3)　K　mol(-1),　theta　=　-　1.140　K.　[GRAPHICS]　.