Tm 3+ ) microspheres were successfully synthesized via a facile sacrificial template method by employing PS spheres as hard template followed by a subsequent heating process. The structure, morphology, and formation process are well investigated by various techniques. A systematic study on the up-conversion (UC) PL properties of La 2 O 3 :Yb 3+ /Er 3+ /Tm 3+ products have been performed in detail. Under 980 nm laser diode excitation, La 2 O 3 :Yb 3+ /Tm 3+ , La 2 O 3 :Er 3+ and La 2 O 3 :Yb 3+ / Er 3+ products are mainly dominated by blue, green, and red light emissions, respectively. By increasing Er 3+ concentration, the La 2 O 3 :Er 3+ gives yellow emission. Furthermore, the UC white light was successfully obtained in the La 2 O 3 :Yb 3+ /Er 3+ /Tm 3+ system by adjusting the relative doping concentration of Yb 3+ , Er 3+ and Tm 3+ . The obtained UC white light can be tuned at a wide range, and the optimal white-emitting CIE (Commission internationale de l'e ´clairage [International Commission on Illumination]) chromaticity coordinate is (x = 0.3250, y = 0.3180), which is very close to the standard equal energy white light (x = 0.33, y = 0.33). The strategies for color tuning of up-conversion emission proposed in the current system may be helpful for other ones to achieve efficient multicolor (including white light) luminescence under 980 nm laser excitation. Because of abundant luminescent colors from RGB to white in La 2 O 3 :Yb 3+ /Er 3+ / Tm 3+ samples under 980 nm laser diode (LD) excitation, they can potentially be used as fluorophores in the field of color displays, back light, UC lasers, and photonics.

Four metal complexes [Pd(L(1))Cl(2)·2H(2)O] (1), [Pt(L(1))Cl(2)·2H(2)O] (2), [Pd(L(2))Cl(2)·H(2)O] (3) and [Pt(L(2))Cl(2)·H(2)O] (4) (L(1) = 2,2'-bipyridyl-5,5'-dicarboxylic acid, L(2) = 2,2'-bipyridyl-4,4'-dicarboxylic acid) have been synthesized under hydrothermal conditions and fully characterized by IR and (1)H-NMR spectra, elemental analysis, and X-ray single crystal diffraction analysis. Interactions of these complexes with fish sperm DNA (FS-DNA) were investigated using UV-Vis absorption and fluorescence spectroscopic methods. Further insight was brought by quantum chemistry calculations by means of G03 package and taking B3LYP functional Lanl2dz Gen basis set. Agarose gel electrophoresis run on pBR322 plasmid DNA gave proof that all four complexes exhibit efficient DNA cleavage. Complexes 1-4 manifested cytotoxic specificity and a significant cancer cell inhibitory rate. Independent apoptosis tests under the light microscope, performed on hematoxylin-eosin stained HeLa cells, evidenced morphological changes induced by all the complexes.

This work introduces the new trimetallic complex CoPd(HBPDC)Cl·(HO)(HBPDC = 2,2'-bipyridine-4,4'-dicarboxylic acid) as a highly efficient and more cost-effective catalyst for a Suzuki-Miyaura reaction proceeding in water, without additives and under aerobic conditions. Catalytic studies revealed a synergistic Co-Pd cooperativity, fostered by ligation through HBPDC, and accounting for the superior performance of the heterobimetallic complex vs. its Co-free counterpart.

The reaction of 3-(2,4-dicarboxyphenyl)-2,6-pyridinedicarboxylic acid (H4dppd) with rare earth nitrates under hydrothermal conditions generated a series of new two-dimensional (2D) coordination polymers, namely {[La(Hdppd)(H2O)2·(H2O)2]n (1), [Ln2(Hdppd)2(H2O)4·(H2O)3]n [Ln = Sm (2), Eu (3)] and [Ln(Hdppd)(H2O)3·H2O]n [Ln = Gd (4), Tb (5), Dy (6), Ho (7), Er (8)] [Hdppd = 3-(2,4-dicarboxyphenyl)-2,6-pyridinedicarboxylic trivalent anion]}. The complexes were characterized by X-ray single-crystal diffraction, infrared spectroscopy, elemental analysis and thermogravimetric analysis. Luminescence spectroscopy of 3 and 5 showed bright red and green luminescences due to the 4f(n)-4f(n) transitions in Eu(3+) and Tb(3+) respectively, although the luminescence lifetime is shortened by non-radiative decay due to the presence of coordinating water molecules. The magnetic properties of 2-8 were measured and discussed. Compound 6 exhibits frequency dependent out-of-phase signals, and ferromagnetic coupling exists in 8.