Synthesis and properties of Zn <sup>2+</sup> /Cd <sup>2+</sup> -directed self-assembled metallo-supramolecular polymers based on 1,4-diketo-pyrrolo[3,4-c]pyrrole (DPP) derivativesXuegang Chen, Hongbin Qiao, Kai Guo et al.|RSC Advances|2014Cited by 14