Family Of Lanthanide Research Articles

A new family of dimeric lanthanide (III) complexes: Synthesis, structures and photophysical property

A new family of lanthanide complexes with the general formula {[Ln(nphth)(Hnphth)(H 2O) 3·H 2O] 2} n (Ln = Pr, Eu, Gd, Tb, Dy, 1–5 and H 2nphth = 3-nitrophthalic acid) have been synthesized under hydrothermal condition and four of them have been characterized by single-crystal X-ray diffraction and spectroscopy. These compounds are isostructural and the lanthanide ions are all nine coordinated and europium complex emits characteristic red fluorescence of Eu 3+ ions at room temperature while other three lanthanide complexes exhibit the particular emission ascribed H 2nphth ligand, which suggest that the different energy transfer process takes place.

From rational octahedron design to reticulation serendipity. A thermally stable rare earth polymeric disulfonate family with CdI2-like structure, bifunctional catalysis and optical properties

A new family of lanthanide disulfonates Ln(OH)(NDS)(H2O), (Ln = La, Pr and Nd; NDS=1,5-naphthalenedisulfonate) was designed and hydrothermally synthesized; this is the first example of a disulfonate ligand coordinated to six different Ln atoms; these materials, with high thermal stability, act as active and selective bifunctional catalysts in oxidation and epoxide ring opening; strong luminescence from the optically active Nd center was observed.

A new family of two-dimensional lanthanide(III) coordination polymers: synthesis, structures and properties of [Ln(SIP)(H 2O) 4] n (Ln=Eu, Gd, Ce, and NaH 2SIP=5-sulfoisophthalic acid monosodium salt)

A new family of lanthanide coordination polymers with the general formula [Ln(SIP)(H 2O) 4] n (Ln=Eu, Gd, Ce, 1– 3; and NaH 2SIP=5-sulfoisophthalic acid monosodium salt) was hydrothermally synthesized and characterized by IR, elemental analysis, single-crystal X-ray crystallography and powder X-ray diffractions. X-ray studies indicated that these compounds are isostructural and adopt an electrically neutral and undulating two-dimensional layer structure constructed from fused {[Eu(H 2O) 4] 3(SIP) 3} pseudo-hexagonal grids. Thermogravimetric measurements in N 2 revealed that all exhibit weight losses corresponding to four water molecules per formula unit around 120 °C and the dehydrated compounds are stable up to ca 510 °C. The fluorescence spectrum showed that [Eu(SIP)(H 2O) 4] n displays intense red fluorescence in the solid-state. The paramagnetism for [Gd(SIP)(H 2O) 4] n in the range 5–300 K reveals no magnetic coupling via SIP ligand.

Enthalpies of formation of lanthanide oxyapatite phases

A family of lanthanide silicates adopts an oxyapatitelike structure with structural formula Ln9.33 0.67(SiO4)6O2 (Ln = La, Sm, Nd, Gd, = vacancy). The enthalpies of solution, ΔHS, for these materials and their corresponding binary oxides were determined by high-temperature oxide melt solution calorimetry using molten 2PbO B2O3 at 1078 K. These data were used to complete thermodynamic cycles to calculate enthalpies of formation from the oxides, ΔH0 f-oxides (kJ/mol): La9.33 0.67(SiO4)6O2 = 776.3 ± 17.9, Nd9.33 0.67(SiO4)6O2 = 760.4 ± 31.9, Sm9.33 0.67(SiO4)6O2 = 590.3 ± 18.6, and Gd9.33 0.67(SiO4)6O2 = 446.9 ± 21.9. Reference data were used to calculate the standard enthalpies of formation from the elements, ΔH0 f (kJ/mol): La9.33 0.67(SiO4)6O2 = 14611.0 ± 19.4, Nd9.33 0.67(SiO4)6O2 = 14661.5 ± 32.2, Sm9.33 0.67(SiO4)6O2 = -14561.7 ±; 20.8, and Gd9.33 0.67(SiO4)6O2 = -14402.7 ± 28.2. The formation enthalpies become more endothermic as the ionic radius of the lanthanide ion decreases.

Evidence for adduct formation at the semiconductor-solution interface: photoluminescent properties of cadmium selenide in the presence of lanthanide .beta.-diketonate complexes

Photoluminescence (PL) measurements of etched, single-crystal n-CdSe demonstrate that the semiconductor surface engages in adduct formation with a family of lanthanide {beta}-diketonate complexes, Ln(fod){sub 3} (Ln = lanthanide; fod = 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionato anion), in isooctane ambient.