Study On The Spectral Character Of The Complexes Of Rare Earth Polyamide

Poly(N-vinylacetamide) (PNVA) is a polyamide that is innoxious and possesses goodphysiological consistent. It is soluble in both water and organic solvents, the polymer has acquired agreat importance for their wide applications in biomedical materials, luminous materials. Thispolymer can show much more specialities such as light-emitting, high magnetic by adding rareearth ions. In this paper, some works were carried out, which was a studying on polyamidematerials containing rare earth elements.PNVA was synthesized by free radical polymerization with NVA. The binary complex ofRE(â…¢)-PNVA(RE :Samarium, Europium, Terbium and Dysprosium) was synthesized at the roomtemperature. Several series of doped and ternary rare earth-polymer complexes were synthesized forthe first time by adding La3+,Gd3+ or low molecular weight ligand phen to the binary complex ofRE(â…¢)-PNVA. The spectral properties and luminescence behaviors of those materials were studiedby means of Fourier transform infrared transmission spectroscopy(FT-IR), ultravioletspectroscopy(UV), X-ray photoelectron spectroscopy(XPS) and fluorescence spectroscopy. On thebasis of former works, the complexes of Mn(â…¡)-PNVA, Eu( â…¢ )-Mn(â…¡)-PNVA andTb(â…¢)-Mn(â…¡)-PNVA were synthesized and characterized, the luminescence behaviors of thesecomplexes were also studied.The experimental results of UV, FT-IR, XPS and fluorescence spectroscopy suggested thatthere exist coordination interactions between PNVA and rare earth ion (Sm3+,Eu3+,Tb3+,Dy3+,La3+,Gd3+) in these doped complexes. There existed coordination interactions among rare earth ions(Sm3+,Eu3+,Tb3+,Dy3+), PNVA and phen in these ternary complexes of RE(â…¢)-PNVA-phen. AlsoMn2+ can coordinate with the polymer of PNVA. These coordination interactions maybe change theconformation and conjugated structure of these polymers and further influence the spectralproperties of absorption and emission.The fluorescence emission spectra of rare earth complexes show intensive emissions by addingLa3+, Gd3+ or phen. In these complexes , the complexes of Sm and Dy display merely intensiveemission bands of polymeric ligands. The complexes of Eu and Tb show greatly intensivecharacteristic emissions of rare earth ions, indicating that there exists effective energy transferbehavior between europium, terbium ion and polymer ligand. Also the characteristic fluorescenceemission of rare earth ions in the complexes of Eu(â…¢)-Mn(â…¡)-PNVA and Tb(â…¢)-Mn(â…¡)-PNVAwere greatly increased by adding a small quantity of Mn2+.In the ternary complexes, the characteristic emission intensities of rare earth ions were greatlyincreased by the introduction of La3+,Gd3+ or low molecular weight ligand as a result of synergeticeffect between them. Especially, the complexes of Tb(â…¢)-La(â…¢)-PNVA and Tb(â…¢)-PNVA-phenare potential luminescent materials in respect that not only they can emit intensive monochromaticlight, but also they have stable chemical characters.