基于一种柔性二羧酸和不同双咪唑配体构筑的两例钴-穿插网格（英文）

基于一种柔性二羧酸和不同双咪唑配体构筑的两例钴-穿插网格（英文）Introduction:Metal-organic frameworks (MOFs) are porous materials wi

基于一种柔性二羧酸和不同双咪唑配体构筑的两例钴 - 穿插网格（英文） Introduction: Metal-organicframeworks(MOFs)areporousmaterialswith tunablestructuresandproperties,whichhaveattractedsignificant attentioninthefieldsofcatalysis,gasstorage,separation,and sensing.Inrecentyears,thedesignandsynthesisofmetal-organic frameworksbasedonflexibleligandshavereceivedconsiderable attentionowingtotheiradvantagesinstructuraldiversity, dynamicproperties,andfacilesolid-statetransformations.Among thevariousflexibleligands,dicarboxylicacidshavebeenwidely usedforconstructingMOFsduetotheirabilitytocoordinatewith metalionsviacarboxylategroups,whichformrobustcoordination bonds.Additionally,bis(imidazole)ligandshaveshowntobe versatilebuildingblocksforMOFs,exhibitingstrongcoordination abilitiesanddiverseconformations.Inthispaper,wereportthe synthesisandcharacterizationoftwocobalt-interpenetrated MOFs,whichareconstructedusingaflexibledicarboxylicacidand differentbis(imidazole)ligands. Experimental: Thedicarboxylicacid,4,4'-biphenyldicarboxylicacid(BPDC), wassynthesizedfollowingapublishedprocedure.Two bis(imidazole)ligands,1,1'-hexamethylenebis(imidazole)(HMBI) and4,4'-biphenylenebis(imidazole)(BPBI),werepurchasedfrom commercialsources.ThesynthesisoftheMOFswascarriedout usingasolvothermalmethod.Inatypicalsynthesis,amixtureof BPDC,HMBIorBPBI,andcobaltnitratehexahydrate (Co(NO3)2·6H2O)wasdissolvedinN,N-dimethylformamide(DMF) toformaclearsolution.Thesolutionwasthentransferredtoa Teflon-linedstainless-steelautoclaveandheatedat120°Cfor24 hours.Aftercoolingtoroomtemperature,theresultingprecipitate wasfiltered,washedwithDMFandethanol,anddriedunder vacuum.ThecrystalstructuresoftheMOFswerecharacterized usingsingle-crystalX-raydiffraction(SCXRD).Thethermalstability oftheMOFswasevaluatedbythermogravimetricanalysis(TGA). Resultsanddiscussion: