By　taking　the　functional　advantages　of　both　pyrazolate　and　carboxylate　ligands,　a　unique　dual-functional　pyrazolate-carboxylate　ligand　acid,　4-(3,6-di(pyrazol-4-yl)-9-carbazol-9-yl)benzoic　acid　(H(3)PCBA)　was　designed　and　synthesized.　Using　it,　a　new　Co(II)-based　metal-organic　framework　(MOF),　Co-3(PC-BA)(2)(H2O)(2)　(BUT-75)　has　been　constructed.　It　revealed　a　(3,6)-connected　net　based　on　the　6-connected　linear　trinuclear　metal　node,　and　showed　good　chemical　stability　in　a　wide　pH　range　from　3　to　12　at　room　temperature,　as　well　as　in　boiling　water.　Due　to　the　presence　of　rich　exposed　Co(II)　sites　in　pores,　BUT-75　presented　high　selective　CO2　adsorption　capacity　over　N-2　at　298　K.　Simultaneously,　it　demonstrated　fine　catalytic　performance　for　the　cycloaddition　of　CO2　with　epoxides　into　cyclic　carbonates　under　ambient　conditions.　This　work　has　not　only　enriched　the　MOF　community　through　integrating　diverse　functionalities　into　one　ligand　but　also　contributed　a　versatile　platform　for　CO2　fixation,　thereby　pushing　MOF　chemistry　forward　by　stability　enhancement　and　application　expansion.　(C)　2020　Chinese　Chemical　Society　and　Institute　of　Materia　Medica,　Chinese　Academy　of　Medical　Sciences.　Published　by　Elsevier　B.V.　All　rights　reserved.