The　intertwined　exploring　of　solar　water　driven　into　chemical　energy　configurated　by　a　constituted　semiconductor　photocatalyst　under　sunlight　approach　toward　a　remediation　eager　method　that　solve　the　environmental　issues.　Currently　we　optimized　polymeric　carbon　nitride　PCN　by　a　sophisticated　molecular　co-polymerization　process　which　diffused　with　a　mirror　organic　conjugated　heterocyclic　monomer　to　maximize　its　photocatalytic　activity.　Herein,　for　the　1st　time　we　report　an　organic　pi-electron　stacking　conjugated　thiazolothiazole　(TT)　as　a　small　molecule　within　the　framework　of　PCN　to　enhance　the　conductive　optical　and　photocatalytic　properties　of　PCN　under　solar　energy　irradiation.　The　fusion　of　this　bicyclic　thiazolothiazole　(TT)　co-monomer　within　PCN　remarkably　enhanced　the　charge　carrier　motilities　and　giving　a　rigid　packing　due　to　sulfur　contents.　Excitingly　the　as-synthesized　samples　were　processed　under　different　liberated　characterization　such　as　XRD,　FTIR,　BET,　SEM,　TEM,　XPS,　PL,　DRS　and　EPR　under　both　regions　respectively.　Results　reflect　that　the　integration　of　thiazolothiazole　(TT)　in　the　heptazine　structure　of　PCN　alter　a　prodigious　delocalization　in　its　pi-conjugated　system　and　similarly　demonstrating　an　apparent　fluctuation　in　its　surface　area,　electronic　structure,　its　calculated　band　gap,　chemical　composition　analysis　and　maximize　the　process　of　generation　of　electrons　under　solar　light　from　ground　state　(HOMO)　to　the　excited　state　(LUMO)　of　polymeric　carbon　nitride　(PCN).　Beside,　this　unique　integrity　of　TT　co-monomer　with　in　PCN　matrix　remarkably　improve　the　photocatalytic　activity　toward　prosperity　and　the　amount　optimized　CNU-TT12.0　demonstrated　an　outstanding　photocatalytic　activity　of　water　reduction　for　H-2　evolution　and　as　well　of　RhB　pollutant　photodegradation.　The　sample　optimized　display　10.6　enhancement　comparatively　pure　pristine　sample.　(C)　2019　Elsevier　Inc.　All　rights　reserved.