Photocatalytic degradation of dyes is an extremely difficult but very important issue in the field of environment protection. Two coordination polymers (CPs) [Cu(3-bpah)(HD)]n (1) and [Cu(3-dpye)0.5(HD)]n (2) [3-bpah = N,N'-bis(3-pyridinecarboxamide)-1,2-cyclohexane,...