A Pd-metalated porous organic polymer as a highly efficient heterogeneous catalyst for C–C couplings

An efficient catalyst system based on a Pd-metalated porous organic polymer bearing phenanthroline ligands was designed and synthesized.This catalyst was applied to various C–C bond-forming reactions,including the Suzuki,Heck and Sonogashira couplings,and afforded the corresponding products while exhibiting excellent activities and selectivities.More importantly,this catalyst can be readily recycled.These features show that such catalysts have significant potential applications in the future.

Synthesis and structural characterization of a novel metal(Ⅱ)-organic complex based on imidazo[4,5-f]-1,10-phenanthroline

A novel metal（II）-organic complex Co（HIMP）（1,4-bdc）＇3H20 has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffxaction. The complex is a mononuclear Co（II） complex, which is assembled into a 3D supramolecular architecture via strong intermolecular π…π stacking interactions and hydrogen bonds.

Study on the Activity of Sea Cucumber Peptide

[Objective] The aim was to optimize the sea cucumber peptide yield and its activity. [Method] The impact of VC, VE and leathin on the yield and activity of sea cucumber peptide were investigated by using Glutathione as the standard and 1,10-Phenanthroline method. [Result] Under the conditions of 0.1% VC , 0.2% VE and 2.0% leathin, the activity of sea cucumber peptide was about 50% high and the extraction yield of it could reach 7.12%. [Conclusion] The deep processing of sea cucumber provided effective study idea.

Synthesis and Characterization of Molybdenum（VI） Complexes with 1,10-Phenanthroline

The development of routes and strategies for the design and preparation of complexes of 4d metals in moderate oxidation states is of great importance in magnetochemistry, bioinorganic chemistry, materials chemistry and solid-state chemistry. Bidentate ligands containing N or O donors especially phenanthroline have been widely used to form complexes with interesting structural motif. Reaction of M（CO）6 （M = Cr, Mo, W） with phenanthroline has been done in 1935 and produced an interesting stereo structure, but the reaction of MoOE（acac）2 （acac = acetylacetonato） with phenanthroline has not been studied yet. So, in this research, first of all MoOE（acac） 2 was prepared, and then it reacted with bidentate nitrogen donor to lead to produce the complex of [MoOEL2] （L = Phen） and different aspects of this complex were studied. This complex is very active and highly selective epoxidation catalyst. The structure of the product was characterized by various spectral techniques such as elemental analysis, IH NMR, 13C NMR and IR spectroscopy.

Two anomalous convective systems in the tropical western Pacific and their influences on the East Asian summer monsoon

By decomposing outgoing Iongwave radiation through empirical orthogonal function （EOF） analysis, the authors identify two anomalous convective systems in the tropical western Pacific. Besides the classical convective system near the Philippines （PC）, there is another convective system near the Federated States of Micronesia （MC）. As the first EOF component in this region, the variance explained by MC is higher than that by PC. Both MC and PC are regulated by the tropical sea surface temperature （SST） anomalies. While PC is associated with an El Ni^o event, MC is correlated with SST anomalies in the central and eastern Pacific during summer. It is also found that the East Asian summer monsoon （EASM） is influenced by these two convective systems. In general, enhanced （suppressed） convection corresponds to an eastwards （westwards） western Pacific subtropical high with weak （strong） intensity. Besides, the summer monsoon rainfall from the Yangtze River basin to Japan tends to increase （decrease） when PC is suppressed （enhanced）. By comparison, the influence of MC is generally weak, with vague signals in the East Asian continent. Moreover, the influence of suppressed convection on the EASM is more significant than that of enhanced convection.

Crystal structures and thermal decomposition mechanism of four lanthanide complexes with halogen-benzoic acid and 1,10-phenanthroline

This paper describes syntheses and structure determination of four lanthanide complexes [Nd(2-Cl-4-FBA) 3 phen] 2 (1, 2-Cl-4-FBA = 2-chloro-4-fluorobenzoate, phen = 1,10-phenanthroline), [Ln(2,5-DClBA) 3 phen] 2 (Ln = Sm(2) and Tb(3), 2,5-DClBA = 2,5-dichlorobenzoate) and [Sm(2-Cl-4,5-DFBA) 3 (phen)(H 2 O)] 2 (4, (2-Cl-4,5-DFBA = 2-chloro-4,5-difluorobenzo- ate). The complexes were characterized by elemental analysis, infrared and ultraviolet spectra, and X-ray single-crystal diffraction. In the molecular structures of 1 4, two Ln 3+ ions are linked by four carboxyl groups, with two of them in a bridging bidentate mode and the other two in a bridging-chelating tridentate mode, forming four binuclear molecules. In addition, each Ln 3+ ion is also chelated to one phen molecule and one carboxyl group in the complexes, except each Sm 3+ ion in 4 which is bonded to one carboxyl group by unidentate mode and one H 2 O molecule. There are two different coordination polyhedrons for each Nd 3+ ion in the two similar molecular structures of 1 and they are a distorted monocapped square antiprismatic and a distorted tricapped triangular prism conformation, respectively. The coordination polyhedron for each Ln 3+ ion in 2 4 is a nine-coordinated distorted mono-capped square antiprismatic conformation. The complex 3 exhibits green luminescence under the radiation of UV light. The thermal decomposition behaviors of the complexes have been discussed by simultaneous TG/DSC-FTIR technique. The 3D surface graphs for the FTIR spectra of the evolved gases were recorded and the gaseous products were identified by the typical IR spectra obtained at different temperatures from the 3D surface graphs. Meanwhile, we discussed the nonisothermal kinetics of 1 4 by the integral isoconversional non-linear (NL-INT) method.

Crystal structures and thermal decomposition kinetics of lanthanide complexes with 3,4,5-trimethoxybenzoic acid and 1,10-phenanthroline

A series of lanthanide complexes with the 3,4,5-trimethoxybenzoic acid （3,4,5-tmoba） and 1,10-phenanthroline（phen）, [Ln（3,4,5-tmoba）3phen]2（Ln = Pr（l）, Nd （2） and Ho（3））, have been synthesized and characterized by a series of techniques including elemental analysis, IR spectra, X-ray crystallography and TG/DSC-FTIR technology. The three complexes have two kinds of coordination modes, in which the Pr3＋ and Nd3＋ cations are nine-coordinated and the Ho3＋ cation is eight-coordinated. The three-dimensional IR accumulation spectra of gaseous products for complexes 1-3 were analyzed and the gaseous products were identified by the typical IR spectra obtained from the 3D surface graphs. Meanwhile, we obtained the activation energy E of the first steps of complexes 1-3 by the integral isoconversional non-linear （NL-INT） method and discussed the non-isothermal kinetics of complexes 1-3 using the Malek method. Finally, SB（m, n） was defined as the kinetic method of the first-step thermal decomposition. The thermodynamic parameters △G≠, △H≠ and △S≠ of activation at the peak temperature were also calculated.

Theoretical study on second-order nonlinear optical properties of 1,10-phenanthroline Ru(Ⅱ) complexes

The dynamic first hyperpolarizabilities of a series of 1,10-phenanthroline Ru（II） complexes were carried out using density functional theory （DFT）. The results indicate that these complexes have large second-order nonlinear optical （NLO） responses. Specially, complex 6b has a maximal first hyperpolarizability βtot value. The first hyperpolarizabilities can be tuned by changing the ancillary ligand, introducing electron-acceptor group NO2 and/or increasing r-conjugation on phenanthroline. Calculations on absorption spectra demonstrate that the second-order NLO responses of complexes in series a are ascribed to the intraligand charge transfer （ILCT）, while the complexes in series b exhibit metal-to-ligand charge transfer （MLCT） and lig- and-to-ligand charge transfer （LLCT） transition at relatively low-energy absorptions.

Synthesis, characterization, crystal structure and antitumor activities of a novel demethylcantharidato bridged copper(Ⅱ) phenanthroline complex

A new polymeric demethylcantharidato （DCA） bridged copper（II） phenanthroline （phen） complex （[Cu（DCA）（phen）]n-nH20） has been synthesized and characterized by elemental analysis, IR and electronic spectra studies, molar conductivity measure- ment, and single crystal X-ray diffraction. The complex crystallizes in the orthorhombic space group Pbca with crystallo- graphic data： a -- 12.4537（4）/~, b = 9.3897（5） A, c = 30.1264（10） A, and Z = 8. In the crystal structure, the octahedral coordi- nated copper（II） ions are bridged by demethylcantharidate ligands into a one-dimensional zigzag-like structure with the Cu＇＂Cu separation of 6.1719/~, along with phen ligands attached to both sides of the chain altematively. Interdigitation of the chelating phen ligands of two neighboring chains via hydrophobic interaction and van der Waals forces along ac plane forms two-dimensional polymeric bilayers with discrete water sandwich layer between the adjacent polymeric bilayers. The evalua- tion of the cytotoxic activity of the copper（II） complex against HCT-8 （colorectal carcinoma）, A549 （pulmonary carcinoma）, HeLa （cervical cancer）, HepG2 （hepatocarcinoma）, BGC-823 （gastric carcinoma）, and MCF-7 （breast adenocarcinoma） cell lines revealed that it is a potent cytotoxic agent, superior to Na2DCA and phen against HeLa, HepG2 and BGC-823 cells.