The self-assembly of Co(O 2CPh) 2 with a 2,3-dihydroxyquinoxaline (H 2dhq) linker has revealed a new two-dimensional cluster-based compound, [Co 4(OMe) 2(O 2CPh) 2(dhq) 2(MeOH) 2] n, which shows spin-canted magnetization and a definite magnetic hysteresis loop. ? 2011 American Chemical Society.