[摘要]:The spontaneous, dynamic adjustment of equil. condition (KI/CoII ratio) is a key factor in switching the assembly direction of CoII and K4btec (btec = benzene-1,2,4,5-tetracarboxylate). {K2[Co3(btec)2(H2O)4]?H2O}n (1) with a rare scu net was generated within the first three days. A few days later a new product, {K2[Co(btec)]?H2O}n (2) with a pts net-autonomously formed.