Molar ratio induced crystal transformation from coordination complex to coordination polymers

Coordination complex of a copper cyanurate (Cu(II)-CA) was transformed into coordination polymers upon the stimulus of extra Cu(II) through “directed Ostwald ripening”. By increasing the molar ratio of Cu(II) to CA, we obtained two coordination polymers with selective coordination sites: Cu(II)-κN(HCA)κN-Cu(II) and Cu(II)-κN(HCA)κO-Cu(II), which display disparate magnetic interactions.