Polycarboxylate anions effect on the structures of a series of transition metal-based coordination polymers: Syntheses, crystal structures and bioactivities

2D l‐Di‐toluoyl‐tartaric acid Lanthanide Coordination Polymers: Toward Single‐component White‐Light and NIR Luminescent Materials

“…To the best of our knowledge, l ‐DTTA lanthanide coordination polymers have not been previously documented. However, such a structure is similar to the reported transition metal coordination polymer {[Co 8 (cit) 4 (bbi) 6 (H 2 O) 10 ]⋅7 H 2 O} n (H 4 cit=citric acid, bbi=1,10‐(1,4‐butanediyl)bis(imidazole)) with a 2D network …”

“…However,s uch as tructure is similar to the reported transition metal coordination polymer {[Co 8 (cit) 4 (bbi) 6 (H 2 O) 10 ]·7 H 2 O} n (H 4 cit = citrica cid, bbi = 1,10-(1,4-butanediyl)bis(imidazole)) with a2Dn etwork. [19] Luminescenceo fc omplexes 1-4.U pon excitation at 295 nm, the emission spectrum of complex 1 exhibits ab road band around 386 nm arising from the p-p*t ransitiono ft he ligand and the three narrow emission bands at 482, 572, and 662 nm are attributed to 4 F 9/2 -6 H 15/2 , 4 F 9/2 -6 H 13/2 ,a nd 4 F 9/2 -6 H 11/2 transitions of the Dy 3 + ion, respectively (Figure 3a). Since the Dy 3 + ion mainly emits yellow light (572 nm) and the l-DTTA emits blue light (386 nm), it is then possible to realizew hitelight emission from as ingle-component coordination polymer of complex 1 by varying the excitation wavelength.A se xpected, the commission international de I'Eclairage (CIE) coordinates for complex 1 change in the range of (x, y) (0.370, 0.383) to (0.321, 0.277) falling in the region from yellow to blue upon varying the excitation wavelengths from 285 to 305 nm, in which the CIE chromaticity coordinates (0.344, 0.335) upon excitation at 295 nm are very close to white-light emission (Figure 3b).…”