1368-Tetra(1H-pyrazol-4-yl)-9H-carbazole　(H4CTP),　a　tetra-pyrazole　ligand　with　C-s　symmetry,　has　been　synthesized　based　on　a　carbazole　core.　A　solvothermal　reaction　of　this　ligand　with　NiCl2　center　dot　6H(2)O　gave　a　three-dimensional　(3-D)　metal-organic　framework　(MOF),　[Ni(H4CTP)Cl-2]center　dot　nS　(BUT-41),　which　crystallized　in　the　cubic　space　group　Pm-3　in　spite　of　H4CPT　with　a　central　carbazole　core　and　four　peripheral　pyrazole　rings　has　low　symmetry.　The　framework　of　BUT-41　can　be　regarded　as　a　four-connected　3-D　net　with　the　rhr　topology　when　both　the　organic　ligand　and　the　metal　center　are　considered　as　four-connected　nodes.　Nanocages　with　internal　diameter　of　2　nm　are　present　in　the　framework　of　BUT-41,　which　are　formed　by　interconnecting　12H(4)CTP　ligands　and　20　Ni(II)　ions.　Each　nanocage　connects　with　six　adjacent　cages　through　sharing　hexagonal　windows　with　diameter　over　7　angstrom,　resulting　in　3-D　intersecting　channels　of　the　MOF.　Although　the　tetra-pyrazole　ligand　is　not　deprotonated　after　coordination　with　the　metal　ions,　powder　X-ray　diffraction　and　N-2　adsorption　experiments　reveal　that　the　framework　of　BUT-41　is　rigid　and　permanently　porous　with　the　Brunauer-Emmett-Teller　surface　area　up　to　1551　m(2)　g(-1).　Furthermore,　gas　adsorption　experiments　show　that　this　MOF　selectively　adsorbs　CO2　over　N-2　and　CH4.　[GRAPHICS]　.