A series of NaNdF4 nanocrystals was synthesized via a facile hydrothermal route with Nd（C3H7COO）yPhen and Nd（NO3）3·Phen （Phen, 1,10-phenanthroline） as the Nd precursors. Distinct effect of the neutral donor ligand （Phen） on the morphology of NaNdF4 nanocrystals was demonstrated. When Nd（C3H7COO）yPhen was chosen and the hydrothermal reaction temperature was controlled at 220 ℃, the NaNdF4 nanocrystals with uniform short nanorod shape were obtained. The sizes of the as-prepared nanorods could be tuned by changing the hydrothermal temperatures. This method provided a useful way for the preparation of sodium rare-earth fluoride nanocrystals with controlled shapes and sizes.
Two europium trifluoroacetate complexes, Eu（CF3COO）3.phen （1） and Eu（CF3COO）3·bpy （2） （where phen= 1,10-phenanthroline, bpy=2,2＇-bipyridine）, were synthesized and characterized by elemental analysis, Fourier transform infrared spectroscopy （FT-IR）, photoluminescence （PL） spectroscopy and thermogravimetric analysis （TA）. Single-crystal X-ray structure has been determined for the complex [Eu2（CF3COO）6·（phen）3·（H2O）2]·EtOH. The crystal structure of [Eu2（CF3COO）6·（phen）3·（H2O）2]·EtOH shows that two different coordination styles with europium ions coexist in the same crystal and have entirely different coordination geometries and numbers. This crystal can be considered as an 1 ： 1 adduct of [Eu（CF3COO）3·（Phen）2·H2O]·EtOH （9-coordination part） and Eu（CF3COO）3·phen·H2O （8-coordination part）. The excitation spectra of the two complexes demonstrate that the energy collected by ＂antenna ligands＂ is transferred to Eu3＋ ions efficiently. The room-temperature PL spectra of the complexes are composed of the typical Eu3＋ ions red emission, due to transitions between 5D0→7FJ（J=0→4）. The lifetimes of 5D0 of Eu3＋ in the complexes were examined using time-resolved spectroscopic analysis, and the life- time values of Eu（CF3COO）3·phen and Eu（CF3COO）3·bpy were fitting with bi-exponential （2987 and 353 us） and monoexponential （3191 us） curves, respectively. In order to elucidate the energy transfer process of the europium complexes, the energy levels of the relevant electronic states had been estimated. The thermal analyses indicate that they are all quite stable to heat.
She JiangboCui XiaoxiaHou ChaoqiGao ChaoWei WeiPeng Bo
The neodymium trifluoroacetate complexes were synthesized and characterized by single-crystal X-ray diffraction for [Nd（CF3COO）3·Bpy·（H2O）3]Bpy（1）,elemental and TG analysis,FT-IR spectra,and PL spectra for Nd（CF3COO）3·Bpy（2）（Bpy：2,2＇-bipyri-dine）.The most interesting feature of the crystal structure for 1 is that it comprises a coordinated 2,2＇-bipyridine molecule and an out-sphere 2,2＇-bipyridine molecule.At the same time,the C-O distances appeared average which indicates the three atoms of carboxylato forming elec-tron-conjugate system.Hydrogen bond and π-π-stacking link the binuclear to two-dimensional sheet.The optical spectra for 2 exhibited that the complex possessed typical Nd（III） ion absorption and photoluminescence emission.The emission cross-section of 4F3/2→4I11/2 fluores-cence transition（3.63×10-20 cm2） was comparable with some laser glasses,which indicated good radiative properties of this neodymium trifluoroacetate complex in liquid matrix.The thermal analysis indicated that it was quite stable to heat.
