Slow magnetic relaxation in a Tb(iii)-based coordination polymer. Issue 45 (10th October 2018) - Yoshida, Takefumi
Abstract : A Tb(iii )-based coordination polymer (polyTb ) was synthesized by complexation of Tb(NO3 )3 ·(6H2 O) and 4′, 4′′′′-[1, 1′-biphenyl]-4, 4′-diylbis[6, 6′′-bis(ethoxycarbonyl)2′:6′, 2′′-terpyridine](L). Abstract : A Tb(iii )-based coordination polymer (polyTb ) was synthesized by complexation of Tb(NO3 )3 ·(6H2 O) and 4′, 4′′′′-[1, 1′-biphenyl]-4, 4′-diylbis[6, 6′′-bis(ethoxycarbonyl)2′:6′, 2′′-terpyridine](L). The polymer structure was determined by Job's plots, DFT calculation, and X-ray absorption fine structure (XAFS) measurement. Job's plots indicated that the mole ratio (Tb ion : L) is 1 : 1. The optimized model structures suggested a La model: the LaN6 ⋯(OC)2 model. The bond distances of La–O and La–N are ∼2.80 Å and 2.60 Å, respectively. The EXAFS fitting indicated that the bond distances of Tb–O and Tb–N are 2.65 Å and 2.95 Å, respectively.polyTb shows field-induced magnetic relaxation in the solid and solution state. The luminescence ofpolyTb, originating from an f–f transition, was observed ( ϕ = 6.9%).polyTb formed a porous structure on a Si substrate, whereas a fibrous complex structure was formed on glass.polyTb chains are orientated on glass, which were determined by XRD.