Four　coordinated　complexes　MnxNi(1-x)(C2H6N2O)(6)SO4　(x=0,　0.33,　0.75,　0.90)　were　synthesized　and　characterized.　Single-crystal　X-ray　analysis　revealed　that　the　complexes　belong　to　the　trigonal　crystal　family,　R-3c　space　group.　Spiral　and　terraced　nucleus　growth　modes　were　observed　by　atomic　force　microscopy　(AFM)　in　the　crystals.　Thermogravimetric　analysis　(TGA)　and　differential　thermal　analysis　(DTA)　measurements　showed　their　excellent　thermostability　until　200　degrees　C.　UV-vis　spectra　revealed　that　the　transmission　peaks　of　these　crystals　have　a　slight　bathochromic　shift　compared　to　nickel　sulfate　hexahydrate　(NSH),　and　the　transmittance　in　the　UV　range　increased　as　the　proportion　of　Mn2+　increased.　With　their　photophysical　properties　remaining　similar,　the　much　higher　heat　endurance　is　rendering　these　crystals　better　suitable　for　UV　light　filter　(ULF)　applications.