Water-Based Coherent Detection of Broadband Terahertz Pulses.

Both solids and gases have been demonstrated as the materials for terahertz (THz) coherent detection. The gas-based coherent detection methods require a high-energy probe laser beam and the detection bandwidth is limited in the solid-based methods. Whether liquids can be used for THz detection and relax these problems has not yet been reported, which becomes a timely and interesting topic due to the recent observation of efficient THz wave generation in liquids.

Observation of Terahertz Radiation via the Two-Color Laser Scheme with Uncommon Frequency Ratios.

In the widely studied two-color laser scheme for terahertz (THz) radiation from a gas, the frequency ratio of the two lasers is usually fixed at ω_{2}/ω_{1}=1:2. We investigate THz generation with uncommon frequency ratios. Our experiments show, for the first time, efficient THz generation with new ratios of ω_{2}/ω_{1}=1:4 and 2∶3.

[Terahertz Spectroscopic Investigation of Substrate Materials for Biological Application in the Frequency Range of 1～15 THz].

As emerging modalities, terahertz time-domain spectroscopy and imaging have been widely applied to investigate the optical properties of different biological tissues. The substrate materials are usually needed for biological spectroscopic measurements. The ultra-broadband and facility in remote sensing of the terahertz air-biased-coherent-detection (ABCD) system mean it is a good potential tool for the spectroscopic study of biological tissues.

[Application of Terahertz Spectroscopy in the Detection of Chinese Medicine Processed Drugs of Rhubarb].

The changes of composition of the processed traditional Chinese medicine will affect the curative effect of drug, such as the four kinds of processed rhubarb. The characteristics data of each rhubarb was measured with terahertz spectroscopy system and analyzed with chemometrics, and the spectral data was classified according to the category of rhubarb. The substance components of anthraquinone and tannins make changes in processed rhubarb by thin layer chromatography (TLC).

[The Detection of Ultra-Broadband Terahertz Spectroscopy of InP Wafer by Using Coherent Heterodyne Time-Domain Spectrometer].

Indium Phosphide (InP) has attracted great physical interest because of its unique characteristics and is indispensable to both optical and electronic devices. However, the optical property of InP in the terahertz range (0. 110 THz) has not yet been fully characterized and systematically studied.

[The Study on the Far-FTIR and THz Spectra of Azitromycin Drugs with Different Physical Forms].

Far Fourier transform infrared spectroscopy (Far-FTIR) and terahertz time-domain spectroscopy (THz-TDS) were used to measure the fingerprint spectra of Azitromycin suspension, capsule, tablet and dispersible tablet under vacuum and nitrogen conditions, respectively. In the frequency range of 0.2-15 THz, highly resolved spectral features for Azitromycin suspension were measured and some minor differences were observed between domestic and exotic Azitromycin Suspension, such as linewidth broadening and additional peaks.

4,4'-Bipyridine-1,1'-diium bis-(1,3-benzo-thia-zole-2-thiol-ate).

In the title salt, C10H10N2(2+)·2C7H4NS2(-), the complete 4,4'-bipyridine-1,1'-diium dication is generated by a center of symmetry. In the crystal, N-H⋯N hydrogen bonds are observed between the cations and anions.

6-Nitro-1,3-benzothia-zole-2(3H)-thione.

In the title mol-ecule, C(7)H(4)N(2)O(2)S(2), the nitro group is twisted by 5.5 (1)° from the plane of the attached benzene ring. In the crystal, N-H⋯S hydrogen bonds link pairs of mol-ecules into inversion dimers, which are linked by weak C-H⋯O inter-actions into sheets parallel to (101).

4,4'-Bipyridine-3,3'-disulfanediyl-bis-(1H-1,2,4-triazole-5-amine) (1/1).

In the title 1:1 adduct, C(10)H(8)N(2)·C(4)H(6)N(8)S(2)·, the components are connected through N-H⋯N hydrogen bonds, leading to a two-dimensional structure. The C-S-S-C torsion angle is -83.6 (1)°.

[Bis[μ-bis-(diphenyl-phosphino)methane-1:2κ(2)P:P']-bis-(nitrito-κ(2)O,O')]disilver(I) acetonitrile disolvate.

The title complex, [Ag(2)(NO(2))(2)(C(25)H(22)P(2))(2)]·2CH(3)CN, is a centrosymmetric dimer in which two bis(diphenylphosphino)methane ligands bridge two Ag(+) ions, forming an eight-membered ring with a short Ag⋯Ag separation of 3.1809 (5) Å. The distorted P(2)O(2) coordination of the cation is completed by two O-donors from a symmetric bidentate chelate NO(2) (-) anion [Ag-O = 2.

3-Amino-1H-1,2,4-triazole-5(4H)-thione-4,4'-bipyridine (1/1).

The title two-component mol-ecular crystal, C(10)H(8)N(2)·C(2)H(4)N(4)S, was obtained unexpectedly by reaction of Zn(NO(3))(2)·6H(2)O, NH(4)BF(4) with 3-amino-1,2,4-triazole-5-thione (3-AMT) and 4,4'-bipyridine in water. The dihedral angle between the pyridine rings in the 4,4'-bipyridine molecule is 17.00 (13)°.

catena-Poly[[[diaqua-(1,10-phenanthroline-κ(2)N,N')zinc]-μ-4,4'-bipyridine-κ(2)N:N'] dinitrate 4,4'-bipyridine hemisolvate monohydrate].

In the title compound, [Zn(C(10)H(8)N(2))(C(12)H(8)N(2))(H(2)O)(2)](NO(3))(2)·0.5C(10)H(8)N(2)·H(2)O, the Zn(II) atom is coordinated in a distorted octa-hedral geometry by two N atoms from two 4,4'-bipyridine (4,4'-bipy) ligands, two N atoms from a chelating 1,10-phenanthroline ligand and two O atoms from two mutually cis water mol-ecules. The 4,4'-bipy ligands bridge the Zn(II) atoms into a chain structure along [100].

[Far-IR and THz absorption spectra studies of metronidazole, tinidazole and ornidazole].

Metronidazole, tinidazole and ornidazole are 5-nitro-imidazole medicines used particularly for anaerobic bacteria and protozoa infections. The present paper reports that terahertz time-domain spectroscopy (THz-TDS) and Fourier transform infrared spectroscopy (Far-FTIR) were used to measure the fingerprint spectra of metronidazole, tinidazole and ornidazole in the frequency range of 0.9 - 19.

Tetra-kis(triphenyl-phosphane-κP)silver(I) tetra-fluorido-borate.

The title complex, [Ag(C(18)H(15)P)(4)]BF(4), was prepared by the reaction of silver(I) tetra-fluorido-borate and triphenyl-phosphane in the presence of 1,2-bis-(pyridin-2-yl)ethyl-ene. The Ag(I) atom is tetra-hedrally coordinated by four P atoms from triphenyl-phosphane (PPh(3)) ligands. Due to symmetry, the tetra-fluorido-borate anion is disordered over three positions (each with one third occupancy).

catena-Poly[[(isoquinoline-κN)(triphenylphospane-κP)copper(I)]-μ-thio-cyanato-κN:S].

In the title coordination compound, [Cu(NCS)(C(9)H(7)N)(C(18)H(15)P)](n), the Cu(I) atom is tetra-hedrally coordinated by one N atom from an isoquinoline ligand, one P atom from a triphenyl-phospane ligand, and one N and one S atom from two thio-cyanate anions. The thio-cyanide anions bridge the Cu(I) atoms into a chain along [100]. π-π inter-actions between the pyridine and benzene rings of the isoquinoline ligands connect the chains [centroid-to-centroid distance = 3.

5,6-Dimethyl-1,2,4-triazin-3-amine.

In the crystal structure of the title compound, C(5)H(8)N(4), adjacent mol-ecules are connected through N-H⋯N hydrogen bonds, resulting in a zigzag chain along [100]. The amino groups and heterocyclic N atoms are involved in further N-H⋯N hydrogen bonds, forming R(2) (2)(8) motifs.

Tris(2,2'-bi-1H-imidazole-κN,N)-nickel(II) dinitrate N,N-dimethyl-formamide monosolvate.

The reaction of nickel salts and 4,4'-bipyridine with 2,2'-bi-imidazole (H(2)biim) yielded the title complex, [Ni(C(6)H(6)N(4))(3)](NO(3))(2)·C(3)H(7)NO. The Ni(II) atom is chelated by three H(2)biim ligands in a distorted octa-hedral coordination geometry. The two nitrate anions and one dimethyl-formamide (DMF) mol-ecule are not coordinated.

Poly[bis-[μ-1,3-bis-(diphenyl-phosphan-yl)propane-κP:P']-di-μ-thio-cyanato-κS:N;κN:S-disilver(I)].

In the title coordination polymer, [Ag(2)(NCS)(2)(C(27)H(26)P(2))(2)](n), two centrosymmetrically related Ag(+) cations are linked by two thio-cyanate anions into binuclear eight-membered macrocycles. The Ag⋯Ag separation within the macrocycle is 5.4400 (6) Å.

Tris(3-amino-5,6-dimethyl-1,2,4-triazine-κN)silver(I) trifluromethane-sulfonate-3-amino-5,6-dimethyl-1,2,4-triazine (1/1).

The asymmetric unit of the title compound, [Ag(C(5)H(8)N(4))(3)](CF(3)O(3)S)·C(5)H(8)N(4), contains two cations, two anions and two uncoordinated 3-amino-5,6-dimethyl-1,2,4-triazine (admt) ligands. It was prepared from the reaction of silver trifluoro-methane-sulfonate and admt in a 2:3 molar ratio. Both silver(I) ions are bonded to three admt mol-ecules via their 2-position triazine N atoms in almost regular trigonal-planar geometries.

Tetra-kis(triphenyl-phosphane-κP)silver(I) trifluoro-methane-sulfonate dichloro-methane monosolvate.

In the title compound, [Ag(C(18)H(15)P)(4)]CF(3)O(3)S·CH(2)Cl(2), the Ag atom is coordinated by four P atoms from four PPh(3) ligands. The P-Ag-P angles are in the range 108.02 (6)-110.

An ortho-rhom-bic polymorph of pyrazino-[2,3-f][1,10]phenanthroline-2,3-dicarbonitrile.

The title compound, C(16)H(6)N(6), is a polymorph of the previously reported structure [Kozlov & Goldberg (2008 ▶). Acta Cryst. C64, o498-o501].

[1,3-Bis(diphenyl-phosphan-yl)propane-κP,P'](1,10-phenanthroline-κN,N')copper(I) perchlorate.

The title compound, [Cu(C(12)H(8)N(2))(C(27)H(26)P(2))]ClO(4), crystallizes with two Cu(I) complex cations and two perchlorate anions in the asymmetric unit. Each Cu(I) cation is four-coordinated by two P atoms of a 1,3-bis-(diphenyl-phosphan-yl)propane mol-ecule and two N atoms of a 1,10-phenanthroline ligand, with a coordination geometry that can be considered as distorted tetra-hedral. The crystal studied was twinned with a twin ratio of 0.

Bis(2,2'-bi-1H-imidazole-κN,N)bis-(dimethyl sulfoxide-κO)copper(II) bis-(tetra-fluoridoborate).

In the title copper(II) salt, [Cu(C(6)H(6)N(4))(2)(C(2)H(6)OS)(2)](BF(4))(2), the Jahn-Teller distorted octa-hedral coordination sphere of copper is formed from four 2,2'-bi-1H-imidazole N atoms and two dimethyl sulfoxide O atoms. The Cu atom lies on a center of inversion. N-H⋯O and N-H⋯F hydrogen bonds give rise to a one-dimensional structure.

Tetra-aqua-(1,10-phenanthroline-κN,N')cadmium(II) sulfate dihydrate.

In the title mononuclear complex, [Cd(C(12)H(8)N(2))(H(2)O)(4)]SO(4)·2H(2)O, the coordination geometry around the Cd(II) atom is a distorted octa-hedron, with two aqua ligands occupying the axial positions. Inter-molecular O-H⋯O hydrogen bonds lead to the formation of a two-dimensional layer structure parallel to (001). The layers are connected by π-π inter-actions between the pyridyl and benzene rings of the phenanthroline ligands [centroid-centroid distances = 3.