3-Phenyl-2-(pyrrolidin-1-yl)-5,6-dihydro-8H-thio-pyrano[4',3':4,5]thieno[2,3-d]pyrimidin-4(3H)-one.

In the title compound, C(19)H(19)N(3)OS(2), the thio-pyran ring adopts a twist-chair conformation and the pyrimidinone unit is essentially planar, with a mean deviation of 0.0497 Å. The thio-phene ring is essentially planar with a maximum deviation of 0.

Ethyl 2-amino-6-benzyl-4,5,6,7-tetra-hydro-thieno[2,3-c]pyridine-3-carboxyl-ate.

In the title compound, C(17)H(20)N(2)O(2)S, the tetra-hydro-pyridine ring adopts an envelope conformation with the N atom at the flap position; the phenyl ring makes a dihedral angle of 81.06 (10)° with the thio-phene ring. The amino group links with the carbonyl O atom via intra-molecular N-H⋯O hydrogen bonding, forming a six-membered ring.

N-Phenyl-morpholine-4-carboxamide.

In the title compound, C(11)H(14)N(2)O(2), the urea-type NC=ON moiety [planar to within 0.0002 (13) Å] is inclined to the phenyl ring by 42.88 (8) Å, and the morpholine ring has a chair conformation.

1-[1-(Hydroxy-imino)eth-yl]-N-(2-methoxy-phen-yl)cyclo-propane-carboxamide.

The title compound, C(13)H(16)N(2)O(3), adopts an E configuration with respect to the C=N bond and an intra-molecular N-H⋯N hydrogen bond results in the formation of a six-membered ring. In the crystal, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into a chain propagating along the b axis. Very weak π-π stacking inter-actions [centroid-centroid distance = 4.

{2,2'-[5-Bromo-pyridine-2,3-diylbis(nitrilo-methyl-idyne)]diphenolato}chlorido(dimethyl-formamide)manganese(III).

In the title complex, [Mn(C(19)H(12)BrN(3)O(2))Cl(C(3)H(7)NO)], the Mn(III) ion is coordinated by two N and two O atoms from the tetra-dentate Schiff base ligand, one O atom from the dimethyl-formamide ligand and a Cl anion in a distorted octa-hedral geometry. In the crystal structure, weak inter-molecular C-H⋯Cl hydrogen bonds link the mol-ecules into centrosymmetric dimers with a short distance of 3.878 (3) Å between the centroids of the aromatic rings.

Bis(2,2'-bi-1H-imidazole-κN,N)(thio-cyanato-κN)copper(II) chloride.

In the title salt, [Cu(NCS)(C(6)H(6)N(4))(2)]Cl, the Cu(II) atom adopts a five-coordinated square-pyramidal geometry consisting of an N atom from a thio-cyanate anion and four N atoms from two chealting biimidazole ligands. The thio-cyanate ligand occupies the axial position and is, like the Cu(II) centre, located on a mirror plane. The cation and anion are linked into a linear chain by N-H⋯S and N-H⋯Cl hydrogen bonds.

Solid-phase spectrophotometric determination of nickel in water and vegetable samples at sub-mug l(-1) level with o-carboxylphenyldiazoaminoazobenzene loaded XAD-4.

A highly sensitive and selective solid-phase spectrophotometric method for the determination of sub-mugl(-1) level nickel(II) is described. Nickel(II) was sorbed on a styrene-divinylbenzene-type resin Amberlite XAD-4 as a Ni(II)-o-carboxylphenyldiazoaminoazobenzene (o-CDAA) complex. At pH 9.

Preconcentration and determination of trace elements with 2-aminoacetylthiophenol functionalized Amberlite XAD-2 by inductively coupled plasma-atomic emission spectrometry.

2-Aminoacetylthiophenol (AATP)-modified Amberlite XAD-2 has been synthesized by coupling it through NNNH group. The resulting chelating resin, characterized by elemental analysis, thermogravimetric analysis (TGA) and infrared (IR) spectra, was used to preconcentrate Cd, Hg, Ag, Ni, Co, Cu and Zn ions. Several parameters, such as distribution coefficient and sorption capacity of the chelating resin, pH and flow rates of uptake and striping, volume of sample and eluent, were evaluated.

Spectrophotometric determination of lead in vegetables with dibromo-p-methyl-carboxysulfonazo.

A new highly sensitive and selective chromogenic reagent dibromo-p-methyl-carboxysulfonazo (DBMCSA) was synthesized and studied for the spectrophotometric determination of lead in detail. In 0.25 M phosphoric acid medium, which greatly increases the selectivity, lead reacts with DBMCSA to form a 1:2 blue complex, having a sensitive absorption peak at 648 nm.

3-Phenyl-2-(piperidin-1-yl)-3,5,6,8-tetra-hydro-4H-thio-pyrano[3',4':2,3]thieno[5,4-d]pyrimidin-4-one.

In the title compound, C(20)H(21)N(3)OS(2), the piperidinyl ring has a distorted chair conformation. Weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers. The crystal packing exhibits short inter-molecular S⋯S distances of 3.

(E)-N'-(Furan-2-ylmethyl-ene)-4-(quinolin-8-yl-oxy)butanohydrazide.

In the title mol-ecule, C(18)H(17)N(3)O(3), the dihedral angle between the mean planes of the furan ring and the quinoline group is 77.4 (2)°. In the crystal structure, inter-molecular N-H⋯N hydrogen bonds link the mol-ecules into centrosymmetric dimers.

catena-Poly[[(1,12,15,26-tetra-aza-5,8,19,22-tetra-oxa-3,4:9,10:17,18:23,24-tetra-benzocyclo-octa-cosane-κN,N,N,N)nickel(II)]-μ-terephthalato-κO:O].

In the title compound, [Ni(C(8)H(4)O(4))(C(36)H(44)N(4)O(4))](n), the Ni(II) atom is coordinated in a distorted octa-hedral geometry by the four N atoms of the 1,12,15,26-tetra-aza-5,8,19,22-tetra-oxa-3,4:9,10:17,18:23,24-tetra-benzocyclo-octa-cosane ligand and two O atoms from the terephthalate dianions. The Ni(II) atoms, which lie on inversion centres, are linked via terephthalate ligands to form a chain structure along [101]. The structure is stabilized by three intra-molecular and one inter-molecular N-H⋯O hydrogen bonds.

Bis(acetyl-acetonato-κO,O')(methanol-κO)(thio-cyanato-κN)manganese(III).

In the title complex, [Mn(C(5)H(7)O(2))(2)(NCS)(CH(4)O)], the Mn(III) atom has a slightly distorted octa-hedral coordination formed by five O atoms and one N atom. The equatorial positions are occupied by four O atoms of two acetyl-acetonate ligands, while the axial positions are occupied by the N atom of the thio-cyanate anion and the O atom of the methanol mol-ecule. In the crystal structure, complex mol-ecules are linked by an inter-molecular O-H⋯S hydrogen bond, forming a chain running along [101].

(Amino-acetato-κO,N)bis-(quinolin-8-olato-κO,N)cobalt(III) methanol solvate.

In the crystal structure of the title compound, [Co(C(2)H(4)NO(2))(C(9)H(6)NO)(2)]·CH(3)OH, the Co(III) atom is chelated by two quinolin-8-olate and one glycinate anions in a distorted octa-hedral coordination geometry. The five-membered chelating glycinate ring assumes an envelope conformation. The complex mol-ecules are assembled by inter-molecular N-H⋯O hydrogen bonding.

Highly selective determination of methylmercury with methylmercury-imprinted polymers.

Methylmercury-imprinted and non-imprinted polymers were prepared by formation monomer complex of methylmercury with (4-ethenylphenyl)-4-formate-6-phenyl-2,2'-bipyridine and thermally polymerizing with divinylbenzene (crosslinker) in the presence of 2,2'-azobisisobutyronitrile as initiator and subsequently leached with the acidic thiourea solution (1.0 mol L(-1) of thiourea and 4.0 mol L(-1) of HCl).

Spectrofluorimetric study of the interaction of copper(II) and bis-heterocyclictriazene reagent in the presence of beta-cyclodextrin.

A new reagent, 1,3-bis(2-benzothiazolyl-diazoamino)benzene (BBTAB), was first synthesized and characterized by elemental analysis, 1H NMR and IR spectra. The inclusion complex of BBTAB with beta-cyclodextrin (beta-CD) was formed. BBTAB in the inclusion complex or alone reacts with copper(II) to form chelate complex in a slight basic medium, which results in drastic or slight fluorescence enhancement, respectively.

Biosorption and preconcentration of lead and cadmium on waste Chinese herb Pang Da Hai.

The biosorption behavior of the solid waste Chinese herb Pang Da Hai (seeds of Sterculia lychnophera Hance) was studied as a sorbent for trace lead and cadmium. The solid waste Chinese herb Pang Da Hai has good sorption and desorption properties for Pb and Cd. The sorbed waste Chinese herb Pang Da Hai was both easily eluted with 0.