The　MnII-based　porous　metal-organic　framework,　[Mn3(btca)2(HCOO)(μ3-OH)(H2O)2]·2DMF　(1)　(H2btca　=　benzotriazole-5-carboxylate　acid),　was　prepared　by　the　solvothermal　reaction　of　Mn(CH3COO)2·4H2O　and　H2btca,　which　was　characterized　by　infrared　spectroscopy,　thermogravimetric　analyses,　and　X-ray　crystallographic　study.　1　exhibits　3D　framework　with　1D　rectangle　channels　constructed　by　the　strip-shaped　chains　containing　[Mn5(μ3-OH)2(btca)4]–　pentaclusters　subunits.　Furthermore,　the　magnetic　measures　show　that　1　exhibits　weak　ferromagnetic　behavior　at　low　temperature.　©　2017　WILEY-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim