Hydrothermal syntheses, structures and photophysical properties of two lanthanide isonicotinic acid complexes.

Two rare earth isonicotinic acid compounds [Y(HIA)2(H2O)4(NO3)](2NO3) ((1); HIA = isonicotinic acid) and [LaHg3Cl8(HIA)4]nnCl (2) were reported. Compound one features an isolated (0-D) structure, while compound two has a two-dimensional (2-D) structure. The rare earth ions are coordinated by eight oxygen atoms to display a square antiprismatic REO8 geometry. Compound one shows blue photoluminescence and it has CIE chromaticity coordinates of 0.2332 and 0.3104. The CCT of compound 1 is 13755 K. Compound two exhibits green photoluminescence and it has CIE chromaticity coordinates of 0.3663 and 0.6184. The CCT is 4997 K. Their band gaps are 2.86 and 3.12 eV. [ABSTRACT FROM AUTHOR]