Electron Ionization Mass Spectrometry of Some Ferrocenyl Thia-crown Ethers

ＥｌｅｃｔｒｏｎＩｏｎｉｚａｔｉｏｎＭａｓＳｐｅｃｔｒｏｍｅｔｒｙｏｆＳｏｍｅＦｅｒｒｏｃｅｎｙｌＴｈｉａ┐ｃｒｏｗｎＥｔｈｅｒｓＳＵＪｉｎｇ－ｚｈｅａｎｄＪＵＹｉｎｇ（ＢｅｉｊｉｎｇＩｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｃａｌＲｅａｇｅｎｔｓ，Ｂｅｉｊｉ...     

Theoretical Study on the Reaction Mechanism of F2 ＋ 2HBr = 2HF ＋ Br2

1 INTRODUCTION The replacement reactions between halide and hy- drogen halide, or halide and halide are basic reac- tions in chemistry. Goldfinger et al. have speculated by experiment that the gas reaction between chlorine and hydrogen bromide might be a two-step intermo- lecular reaction[1, 2]. But gas reactions between other halides and hydrogen halides haven’t been reported experimentally so far. About theoretical investiga- tion, colinearity quantum mechanics, vibrational tran- sitio…     

Crystal Structure of a Linear Ag(I) Complex with Niflumic Acid and Its Fluorescent Property

1 INTRODUCTION Niflumic acid (2-[3-(trifluoromethyl) phenyl] amino nicotinic acid, HNifa) is an organic fluoro compound used in the preparation of ‘Donalgin’ as the active substance. In medicine, HNifa has been widely used as a non-steroidal anti-inflammatory analgetic drug[1]. The extensive application of this preparation in medical practice has attracted much interest in other various biological fields such as the determination in serum, urine[2～4], and coordination behaviors with …     

Synthesis and Crystal Structure of 6—Bromo—piperonal—dimethyl—acetal

1 INTRODUCTION 6-Bromo-piperonal-dimethyl-acetal is an intermediate used for the synthesis of natural products, such as podophyllotoxin[1] and the related compounds[2～6] due to the useful biological activities associated with some of its derivatives[7, 8]. In particular, glycoside derivatives of 4?dimethyl- 4-epipodophyllotoxin have been used in cancer chemotherapy[9, 10]. The title compound has been synthesized from raw material piperonal, after bromo substitution and acetal protection…     

Synthesis and Crystal Structure of a 3-D Hydrogen-bonded Supramolecular Decavanadate Compound [Habo]_6[V_(10)O_(28)]·2C_3H_7OH·2H_2O

1 INTRODUCTION The chemistry of polyoxometalates has been at- tracting much attention due to the richness in their structures, electron and proton storage abilities, ther- mal stability and applications in catalysis, medicine and surface sciences[1～3]. In recent years, the mixed- valence as well as full oxidized vanadium polyoxo- anions have been crystallized with a variety of orga- nic molecules as counteranions[4～8]. However, the guiding principles of the crystal structures of poly- o…     

Synthesis and Structural Characterization of a New Cadmium(II) Complex with a Double Betaine

1 INTRODUCTION The construction of supramolecular aggregates has received much attention due to their intriguing network topologies and potential functions as new classes of materials[1, 2]. Multiple noncovalent interac- tions, such as hydrogen bonds, π-π stacking and host- guest ionic interactions, play important roles in the supramolecular assembly of metal ions and organic ligands[3, 4]. In this context the multidentate ligands with conjugated groups are employed as building blocks in…     

Synthesis and Crystal Structure of [Ni(bdpm)_2(OAc)]_2(N_3)_2·5H_2O(bdpm=Bis(3,5-dimethylpyrazol-1-yl)methane,OAc=CH_3COO~-)

1 INTRODUCTION Bis(pyrazol-1-yl)methane has been one of the po- pular polydentate nitrogen donor ligands due to its strong chelating coordination to transition metal ions as capping ligand. Coordination behavior of the li- gand is able to yield stable M-N-N-C-N-N six-mem- bered boat conformation[1, 2]. The complexes con- taining bdpm ligand have been widely synthesized and characterized in recent years, and exhibit the striking properties in catalysis, magnetism and so on[3-10]. For exa…     

A Novel 3D Extended Network Cobalt Paradodecatungstate:Synthesis,Characterization and Crystal Structure of [Co(H_2O)_5]_2[Co(H_2O)_4]_3[H_2W_(12)O_(42)]·11H_2O

1 INTRODUCTION Polyoxometalates are the unique metal-oxygen clusters composed of transition metals in groups V and VI (Mo, W, V, Nb, Ta) in a high oxidation state showing a large structural varieties as well as inte- resting physical and chemical properties in diverse fields including catalysis, analytical chemistry, nanotechnology, chemical sensing, biochemical and geochemical processes, medicine and materials science[1～5]. Recently, there has been increasing interest in the synthesis…     

Hydrothermal Synthesis and Crystal Structure of [H_4As_8V_(14)O_(42)(H_2O)]·6H_2O

1 INTRODUCTION The chemistry of polyoxometalates continues to attract interest as a result of their realized and potential applications in diverse fields, such as cata- lysis, analysis, biochemistry, medicine and material science[1～3]. In the past few …     

Synthesis and Structural Characterization of a Ni(Ⅱ) Complex [Ni(H_2O)_4(4,4'-bipy)_2](hca)_2

1 INTRODUCTION The rational design and synthesis of new metal- organic frameworks have generated considerable interest in supramolecular chemistry and materials science owing to their intriguing structural diver- sities and potential applications as functional mate- rials[1～6]. Carboxylate-containing ligands have attrac- ted considerable attention because of the various coordination modes of carboxylate group, the ability to form hydrogen bonds and the potential applica- tions as functio…