Unsymmetrical pyrazine-modulated oligo-α-pyridylamine ligand N,N-[6-(pyrazin-2- ylamino)pyridin-2-yl, pyridin-2-yl]pyridine-2,6-diamine exhibits a syn-anti-syn-anti-syn-anti conformation in crystals and is built to a double chain supramolecular structure through hydrogen bond and π-π interactions. H3tpz coordinates to metal atoms as a quadridentate ligand in complexes with all-anti mode. The copper(II) and cobalt(II) complexes are constructed into 1-D supramolecular chain structures. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

The diminution of the cage effect leads to production of free radicals via either photolysis in situ or bimolecular reactions of molecules with atoms that are produced in situ from their molecular precursors. Using these methods, we produced and recorded IR spectra of CH3S, ClSCS, and Cl·HCOOH. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

A structural phase transition takes place at 270K on polymorph A of t-{Fe(abpt)2[N(CN)2]2}, the figure indicates the change in the molecular structure before (solid bonds) and after (open bonds) the phase transition, the significant difference is in axial ligand, [N(CN)2]-.(Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

Hybrid Au-CdSe nanowires were synthesized by the use of electrostatic interaction of positively charged CdSe and negatively charged Au NCs in which the dense CdSe NCs are coverd around the Au nanowires. We have dramatically induced the photoluminescence intensity of CdSe quantum dots emitted from plasma antennas through thr incorporation of Au NPs. In addition, the Au-CdSe nanowires exhibit a significant red-shift SP band (77 nm) from 529 to 606 nm and reduce a narrower PL energy band at 625 nm with a peak-width of 23 nm in the solid state. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

Lewis acid, Me3SiOTf, has been shown to be a promising promoter for aza-Michael reaction of relatively acidic primary amide with α,β-unsaturated ketone. A series of α,β-unsaturated ketones were transformed to their corresponding β-amido ketones under the reaction condition. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

1-Bromo-2-naphthylcyclopropene (8), an intermediate for the preparation of 1-substituted 2-naphthyl- cyclopropenes, was synthesized by debromination of 1,1,2-tribromo-2-naphthylcyclopropane (7). Compound 8 underwent bromo-lithium exchange followed by nuclephilic substitution reactions to generate 1-naphthyl-2-(trimethylsilyl)cyclopropene (11) and 1-naphthylcyclopropene (12). The cyclopropenes 8, 11, and 12 reacted with cyclopentadiene to form adducts 9, 13, and 14, respectively. All of these Diels-Alder adducts are endo isomers. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

Three derivatives of 2-amino-3-naphthyl-acrylonitrile were synthesized as potential green luminance dyes. The green emission is derived from a charge transfer transition, which exhibits an apparent solvatochromic effect. The crystal structure of two compounds was resolved by X-ray diffraction analysis. Their spectral features are associated with their electronic configurations, and are verified by ab initio computations. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

A solvent-free phase-transfer catalysis (PTC) method for the N-alkylation of 4-(phenylthio)-5,6-dihydro-2-pyridone has been developed. Suitable reactions of the terminal iodo compounds generate the quinolizidine, pyridoazepine and indolizidine structures. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

An oxybromination of aromatic substrates using hydrogen peroxide and ammonium bromide in the aqueous phase under mild temperature and near neutral pH condition over SBA-15 supported sulfated zirconia catalysts was achieved. A good to excellent para-selectivity was observed‥(Special issue dedicated to Prof. H. S. Wei on the occasion of his 70th birthday and retirement.)

Laser-induced breakdown spectroscopy has been applied to liquid sample. The laser power of each ablating pulse is very critical to obtain a proper analytical dynamic range when the copper captured layer is thick. The amount of copper in the tap water was shown to depend on the retention time of water in copper pipes of the building pluming system.(Special issue dedicated to Prof. H. S. Wei on the occasion of his 70th birthday and retirement.)

Separation of MB, NR, MO and AO7 was successfully achieved by using imidazolium ionic liquid as the eluent additive of reversed-phase HPLC. The effect of ionic liquid additive on the separation of dyes can be attributed to the combined electrostatic interaction of imidazolium cations and the hydrophobic interaction of the of the stationary phase. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

Patients with a symptomatic occlusion of the ICA or MCA are at risk of future stroke. Identification of such patients is important to reduce the damage of cerebral ischemia. We demonstrated that abnormal metabolism may be detected by MRS method. A threshold level of NAA/Cr was shown to be sustainable until the irreversible ischemic ictus occurs. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

The human Granulocyte Colony Stimulating Factor (GCSF) gene was cloned and expressed in yeast. The secreted form has the advantage over the aggregated form and being the intracellular protein in bacterial cells. The required amount of rhG-CSF to obtain the maximum stimulation of succinate dehydrogenase activity is 50 ng in the experimental condition. The important clinical application was for the treatment of neutropenia and the new approaches are for the acute cerebral ischemia and other neuro-degenerated disease. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

Time courses of chitosanase and protease production in a culture of S. marcescens subsp. sakuensis TKU019 on shrimp shell containing media: (▴) chitosanase activity (mU/mL); (·) protease activity (mU/mL); (–o–) pH; (□) OD660. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

The Hdpa (2,2′-dipyridylamine) ligand can be bonded with metal ions respectively in the anti-anti, anti-syn and syn-syn form, in which the anti-syn form is rare in the studies. Interestingly, the Hdpa ligand in the mononuclear copper complex [Cu(Acac)2(Hdpa)2], 1 (Acac=Acetylacetone) prepared by this experiment is in the rare anti-syn form. The Hdpa ligand in the zig-zag chain copper complex [Cu2(μ-CH3CO2)(NCS)2(Hdpa)2]n, 2 prepared by this experiment is in the usual syn-syn form. But in the long chain, CH3CO2- (acetate group) and NCS- (thiocyanate) take turns acting as a bridging group, and the bridging carboxylate ligand is in the rare anti-syn form. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

A novel polydentate ligand, 2,2′-bipyridyl-6,6′-bis(2-acetylpyrazinohydrazone), and its dinickel complex was synthesized and characterized. A double strand helical structure was found. Spectroscopy and the complex formation processes were investigated. A weak antiferromagnetic interaction was observed. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

The reaction of a series of catechols and flavonoids with dpph· in methanol underwent a two electron oxidation with the formation of quinone products. Detailed kinetic study shows that the rate determining step is the first electron oxidation and the specific rate constants fall in the range 101-102 M-1s-1 at μ = 0.10 M [(n-Bu)4N]ClO4. The conjugation between pyrone and catechol rings plays an important role in the reactivity of the flavonoids.(Special issue dedicated to Prof. H. S. Wei on the occasion of his 70th birthday and retirement.)

Highly ordered nanowires with multilayer structure of Ni/Cu and Co/Cu have been prepared by electrodeposition into nanoporous templates. The coercivity and squarness of the nanowires are dependent on the diameter and aspect ratio as well as on dipolar coupling between the ferromagnetic segments. Owing to its high bit density, the structure may be suitable for ultrahigh-density magnetic recording media. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

Two metal complexes [Zn2(BTE)2Cl4] (1a) and [Zn(BTEE)Cl2] (1b) and two coordination polymers [Zn(BTE)2(NO3)2]n (2) and {[Zn(BTE)2(H2O)2](ClO4)2·2H2O}n (3·2H2O, abbreviated in 3) constructed from two structurally related ligands, 2,2′-bis(1H-1,2,4-triazolyl)ether (BTE) and 2,2′-bis(1H-1,2,4-triazolyl)ethoxyethane (BTEE) have been synthesized. Complexes 1a and 1b display zero-dimension macrocyclic ring structures, while coordination polymers 2 and 3 exhibit one-dimension chain and two-dimension corrugated sheet, respectively. Then, intermolecular hydrogen bonding interactions in 1 −3 expand those lower dimension structures to extended frameworks. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

A new self-polymerization of acrylic acid (AA) with a mono-aziridine containing compound (MAP) and resulted in a linear polyethyleneimines (PEI) with poly(β-amino-esters) formation. This self-polymerization took place immediately on mixing at ambient temperature without any catalyst, which was energy-saving, convenient and easy for applications. That process also provided an alternative reaction route for preparing a linear PEI. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

The geometric and electronic structures of mononitrosyl iron complexes (MNICs) modulated by the coordination environment of iron center may control the nitrosylation products of MNICs.(Special issue dedicated to Prof. H. S. Wei on the occasion of his 70th birthday and retirement.)

Quantitatively predictive chemical function-based pharmacophore model was made by using Discovery Studio 2.1 software. The optimal hypothesis consists of four features: three hydrophobic (HYD), and one hydrogen bond donor (HBD) functions. Quinazoline type inhibitor with EGFR together with the pharmacophore mapping from the software offer well interpretation on the structure activities of the inhibitors and afford us important information for protein-ligand relationship. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

Quenched samples prepared at temperatures between 700 and 1450°C, Ln2Zr2O7 (Ln = Sm, Eu) have fluorite phase at lower temperatures and have a pyrochlore at temperature higher than 1100 and 1150°C, respectively for the Sm and Eu. Crystalline phase become more ordered with increasing the prepartion temperatures. Activation energies of the cation and anion ordering decrease with increasing the ionic radius ratios of Ln2Zr2O7.(Special issue dedicated to Prof. H. S. Wei on the occasion of his 70th birthday and retirement.)

The single-phase CoTiO3 powder is successfully prepared at the relatively low temperature of 550°C by a modified sol-gel spin-coating method. XRD and XPS studies revealed that increasing the post-heat treatment temperature leads to an increase in crystallinity and a decrease in the binding energies of Co 2p, Ti 2p, and O 1s electrons. The dielectric constant of annealed CoTiO3 annealed is 34.5. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

We have determined the crystal structure of Gd(CO3)OH using synchrotron powder diffraction data and studied its in-situ phase transitions products at ∼500°C (Gd2O(CO3)2) and 650°C (Gd2O3). (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

Thiol-functionalized meso-structured silicas have been prepared by the co-condensation of tetraethoxysilane and 3-mercaptopropyltrimethoxysilane in the presence of an amphiphilic block copolymer (EO)45-b-(MA)53. Partial S-alkylation of mercapto groups with 9-(chloromethyl)anthracene resulted in the formation of a hybrid material for the detection and removal of copper ions from water. This hybrid material can be recycled and reused for metal ion adsorption. Under neutral conditions, the binding copper(II) ions can be removed by the addition of an aqueous solution of ethylenediamine. The adsorption capacity of the recycled silicas remains the same as the freshly prepared, which makes them promising adsorbents for wastewater cleanup. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

Linear assembly of cysteine-binding gold nanoparticles and nanorods was observed in the cationic CTAB solutions. The behavior of the assembly for gold nanoparticles is found to be size-dependent. On the other hand, the irregular aggregation appeared in the anionic SDS solutions. Experimental results indicate that the ionic surfactant has the extraordinary effect on controlling the interaction of the assembly. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)

In this account, we describe our efforts to investigate the chemistry of a family of chalcogen-containing group 6 (emphasizing on chromium) carbonyl clusters, in which the interesting structural transformations, reactivity, electrochemistry, and magnetism are studied. Furthermore, the practical synthetic methodologies and metal-metal exchange as well as cluster expansion reactions together with structural features of these Cr-containing complexes are compared systematically. (Special issue dedicated to Professor H. H. Wei on the occasion of his 70th birthday and retirement)