[Charge-transfer compounds based on TCNQ: synthesis and spectroscopic properties].

Charge-transfer materials based on organic donors and acceptors have been under investigation, beginning with the first reports of conducting salts of organocyanide acceptors such as TCNQ. Charge-transfer compounds of the pi-electron acceptor 7,7,8,8,-tetracyanoquinodimethane (TCNQ) show unusual electrical and magnetic properties. The form of TCNQ has a dramatic effect on the properties of the kinds of charge-transfer compounds. In order to further study the vibrational spectroscopy of the organic semiconductor, two kinds of (1:1) charge transfer compounds of TCNQ and [RBz(4-CH3)Py][TCNQ](R==Br(1), I (2)) were synthesized and characterized by elemental analysis, infrared spectrum and Raman spectrum. The tested results of elementary analysis of the charge transfer compounds (1) and (2) were consistent with theoretical values. The IR and Raman spectra of (1) and (2) which indicate the presence of a type of TCNQ species, general speaking, the C[triple bond]N stretching frequencies around 2200 cm(-1), were used to determine the average charge on the TCNQ units, v(CN)for the neutral TCNQ molecule is higher than 2200 cm(-1)), however, v(CN) for the compounds is from 2185 to 2156 cm(-1), both shift to lower frequencies, which were consistent with the frequencies of the TCNQ radical anion In conclusion, the results of IR and Raman spectrum were consistent with the TCNQ radical anion in the compounds, namely TCNQ-.

A charge-transfer salt, 3,5-dimethyl-1-(4-nitro-benz-yl)pyridinium 7,7,8,8-tetra-cyano-quinodimethane.

In the title salt, C(14)H(15)N(2)O(2) (+)·C(12)H(4)N(4) (-), the asymmetric unit contains one cation and one anion. C-H⋯N and C-H⋯N and C-H⋯O hydrogen bonds and π-π stacking inter-actions (inter-planar distance 3.845 Å) are found in the crystal structure.

[Hydrothermal synthesis of Co9S8 nanocrystalline aggregations and spectral study].

Co9S8 nanocrystalline aggregations were synthesized in hydrazine hydrate (N2H4 x H2O) solvent at 180 degrees C for 12 h through a hydrothermal method using cobalt sulfate hydrate (CoSO4 x 7H2O) and sodium sulfate (Na2SO3) as the starting materials. The prepared samples were characterized using X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), and transmission electron microscope (TEM). FTIR spectrum was measured using Fourier-transform infrared spectrometer. The results showed that the products were mainly composed of Co9S8 hexagonal flakes, which were about 2.1 microm in diameter and 200 nm in thickness. The flakes consisted of Co9S8 nanocrystallites with an average size of 2.5 nm.

[Synthesis and infrared spectroscopic study of 1-D magnetic chain compound based on [BrBzPy [Ni (dmit) 2]].

The synthesis and functional study of one-dimensional free radical-metal chain compound has been a hotspot task in molecule material, especially in composing high Tc molecule ferromagnet. A new compound [BrBzPy] [Ni(dmit)2] has been prepared and characterized. The crystal structure at room temperature was determined. The crystal is triclinic with space group P21/c, a = 0.627 5(1) nm, b = 1.743 8(3) nm, c = 2.283 9(3) nm, alpha = 90 degrees, beta = 91.87(1) degrees, gamma = 90 degrees, V = 2.497(7) nm3, Z = 4, Mr = 700. 57, and Dc = 1.863 g x cm(-3). The planar [Ni(dmit)2]- is nearly perfect, which shows that it has good conjugate characteristic and is a 1-D magnetic chain compound.

[Spectral research on the effect various metal ions on the of photocatalytic degradation properties of TiO2 nanocrystal].

TiO2 nanocrystalline was prepared by a emulsion method in the mixed solvent of cyclohexane and acetic anhydride using, titanyl organic compound as the precursor. The prepared product was characterized by means of X-ray diffraction (XRD) and Fourier transform infrared spectrum (FTIR). The photocatalytic oxidation of methyl orange with TiO2 loaded with various metal ions was discussed. The spectral research results showed that the photocatalytic reaction of methyl orange with TiO2 loaded with Bi3+ was promoted, some metal ions caused almost no promotion of TiO2 oxidation of methyl orange, and Ni2+ and Fe3+ ions caused a little promotion. The best mass proportion of Bi3+ and TiO2 was defined as 1:8, which has a good photocatalytic activity. The photocatalytic degradation reaction of methyl orange was affected by the concentration of TiO2 nanocrystal, and when the mass proportion of Bi3+ and TiO2 is 1:8, the best photocatalytic activity concentration of TiO2 is about 1.6 g x L(-1).

[Preparation and spectroscopic study of two new charge transfer salts].

TCNQ (TCNQ= tetracyanoquinodimethane) salts have good conductivity. The magnetic properties of substituted benzylpridiniums, such as ferromagnetism, antiferromagnetism and spin Peierls transition, have widely been investigated. In order to obtain some new materials with both conductivity and magnetism, two new organic salts, [NO2BzPy]Cl (1) and [NO2 BzPyNH2]Cl (2), were synthesized and characterized. Further more, two new charge transfer salts, [NO2BzPy] [TCNQ]2 (3) and [NO2BzPyNH2] [TCNQ]2 (4) were synthesized and characterized. The tested results of elementary anAlysis of charge transfer salts (3) and (4) were consistent with theoretical values, and the results of IR indicated that there exist TCNQ and TCNQ anions. One-dimensional molecular column of TCNQ has been formed. Partial charge transfer takes place from [TCNQ]2- to cation.

[Synthesis of nanocrystalline ZnO and its luminescence spectrum].

ZnO nanocrystal was prepared with Zn(CH3COO)2.2H2O and CO(NH2)2 as precursor by a solvothermal process. The products were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), and photoluminescence spectrum (PL). The results show that the ZnO nanocrystal has good characteristics, and the average particle size of the ZnO nanocrystal is about 17.2 nm. There is a broad PL peak for ZnO nanocrystal between 500-700 nm.

[Simultaneous determination of copper and iron by catalytic kinetic spectrophotometry].

A simultaneous catalytic effect copper (II) and iron (III) on the oxidation of acid chrome blue K by potassium bromate in dilute sulfuric acid medium was observed. But there was an obvious difference in their reaction rates, and the ratio of the reaction constant changed with time. And their spectral addiitive properties were not satisfactory. The simultaneous determination of copper and iron by catalytic kinetic spectrophotometric method was realized by using a three-layer Levenberg-Marquardt BP neural network to cope with the experimental data. The optimum conditions of reaction and determination were studied. The calculation results of the determination in synthetic samples and human hair were satisfactory.

[Research on the synthesis and spectroscopy of the copolymer of polyvinyl alcohol and amino acid].

In this paper, a series of new polymers with grafted amino acids were synthesized. The purpose of the research is to develop a kind of polymer drugs with grafted amino acids for the treatment of some patients. The preparations of polyvinyl alcohol and amino acid were described by using inorganic acid as catalyst. The reaction methods were investigated in order to find the optimal conditions for the highest yield and purity. The copolymers were analysed and characterized by IR and 1HNMR. The result indicated that the reaction products were what we needed and the yield of the polymer of polyvinyl alcohol and glycine was higher than that of polyvinyl alcohol and alanine.

[Bimetallic coordination polymers [[ML][FeIIFeIII(ox)3].1.5H2O] infinity with layer structure syntheses, spectra characterization].

Two new schiff base complexes, NiL(ClO4).3H2O (1) and CuL(ClO4).4H2O (2) [L was condensed from equation molar salicylaldehyde and diethylenetriamine] have been synthesized and characterized. Further, two new bimetallic coordination polymers, [[ML][FeIIFeIII(ox)3].1.5H2O] infinity were synthesized and characterized, where ox2- = oxalate, M = Ni2+ (3) or Cu2+ (4). The tested results of elementary analysis of coordination polymers (3) and (4) were according with the theoretical value, and the results of the IR indicated that the coordination of oxalate were bridgetype in compound (3) and (4). 2-D layer coordination polymers were synthesized by oxalate and Fe3+, Fe2+. The result of Mössbauer spectra of (3) and (4) in room temperature revealed that two different postural ferric ions were found in coordination polymer (3) and (4), and anions layer was formed by [FeIIFeIII(ox)3]- unit. The compounds of (3) and (4) were bimetallic coordination polymers.