Metal-free　carbonitride(CN)　semiconductors　are　appealing　light-transducers　for　photocatalytic　redox　reactions　owing　to　the　unique　band　gap　and　stability.　To　harness　solar　energy　efficiently,　CN　catalysts　that　are　active　over　a　wider　range　of　the　visible　spectrum　are　desired.　Now　a　photochemical　approach　has　been　used　to　prepare　a　new-type　triazine-based　CN　structure.　The　obtained　CN　shows　extraordinary　light-harvesting　characteristics,　with　suitable　semiconductor-redox　potentials.　The　light　absorption　edge　of　the　CN　reaches　up　to　735　nm,　which　is　significantly　longer　than　that　of　the　conventional　CN　semiconductor　at　about　460　nm.　As　expected,　the　CN　can　efficiently　catalyze　oxidation　of　alcohols　and　reduction　of　CO2　with　visible　light,　even　under　red-light　irradiation.　The　results　represent　an　important　step　toward　the　development　of　red-light-responsive　triazine-based　structures　for　solar　applications.　©　2018　Wiley-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim