W. Xin
2014
Citations
0
Influential Citations
2
Citations
Journal
Chinese Journal of Inorganic Chemistry
Abstract
Abatract: Six new 1D lanthanide-based coordination polymer helical chains with formulas of {[Ln(FINA)3(H2 O)2 ]· H2 O}n(Ln=Pr(1), Nd(2), Eu(3), Gd(4)), {[Dy(FINA)3(H2 O)2 ]}n(5), and {[Gd(FINA)2(phen)(OH)]}n(6)(HFINA=2-Fluoroisonicotinic acid, phen=1,10-phenthroline), were synthesized and structurally characterized. It is the first time that 2-Fluoroisonicotinic acid is employed in producing coordination polymers. Carboxylate moieties of the ligand in these compounds exhibit two types of coordination modes because of the lanthanide contraction effect. Ln3+ion is coordinated by eight donor atoms in a distorted bicapped trigonal-prismatic arrangement in 1~4 while in distorted dodecahedron geometry in 5~6. All of helical chains are further extended via the intermolecular π… π interactions, strong O-H … O/N hydrogen bonds and C-H … F hydrogen bonds into a 3D supramolecular structures. Interestingly, in 1~4, there is a small 1D solvent channel along the b-axis, where water molecules are located. The luminescence properties of 3 and 4 have been investigated and the result indicate that compound 3 displays intense red luminescence and exhibits the characteristic transition of the Eu3+ion with a decay lifetime of 333.81 μs, while 4 would be attributed to the intraligand fluorescence, based on the emission spectrum of the free ligand. The magnetic properties of 2 ~6 reveal the weak antiferromagnetic characters. Additionally, the thermal analyses suggest the high thermal stability of compounds 1~6. CCDC: 977317, 1; 977318, 2; 977319, 3; 977320, 4; 977321, 5; 977322, 6.