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A bi-phosphonate ligand 4,4′-bis(diethylphosphonomethyl)biphenyl has been designed and synthesized. The ligand reacted with lanthanide nitrates forming three different types of coordination complexes: interwoven net polymer (type I), linear polymer (type II), and ladder polymer (type III). The photophysical properties of Sm3+, Eu3+, Tb3+ and Dy3+ complexes were investigated. The Sm3+, Eu3+ and Dy3+...
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