Structure and spectroscopic and magnetic properties of rare earth metal(III) derivatives with the 2-formyl-4-methyl-6-(N-(2-pyridylethyl)formimidoyl)phenol ligand

摘要: The compounds [ML[sub 2](H[sub 2]O)[sub 4]](ClO[sub 4])[sub 3][center dot]4H[sub 2]O ((1)M), where M is a trivalent rare earth metal and L the bidentate liquid 2-formyl-4-methyl-6-(N-(2-pyridylethyl)formimidoyl)phenol, have been synthesized. Single crystals of [GdL[sub 2]Cl[center dot]2.75H[sub obtained, its crystal structure has solved. This compound crystallizes in monoclinic system, space group P2[sub 1]/c. consists 4]][sup 3+] cations, perchlorate chloride anions noncoordinated water molecules. Gd atom surrounded by eight oxygen atoms, four belonging to molecules other carbonyl phenolic functions two ligands. coordination sphere very close perfect square antiprism. (1)Eu exhibits strong luminescence solid state. transition energies spectrum determined. temperature dependences molar magnetic susceptibility [chi][sub M] for (1)M (M = Gd, Nd, Eu, Sm) measured. A Curie law observed (1)Gd. EPR reveals zero-field splitting within [sup 8]S[sub 7/2] ground state characterized an axial parameter [vert bar]D[vert bar] 4.0 [times] 10[sup [minus]2] cm[sup [minus]1]. M]T (1)Ndmore » decreases from 1.64 3] K mol[sup [minus]1] at 300 down 0.8 4.2 as T lowered, due crystal-field 4]I[sub 9/2] free-ion For both (1)Sm compound, first excited states are thermally populated K; hence, their behaviors significantly deviate law. data satisfactorily interpreted approximation. (1)Eu, excellent agreement between optical properties obtained. 29 refs., 7 figs., 3 tabs.« less