In the title compound, [ZnBr(2)(C(24)H(16)N(6))], the Zn(II) ion is coordinated by the N,N',N''-tridentate 2,3,5,6-tetra-2-pyridyl-pyrazine ligand and two bromide ions, generating a distorted ZnN(3)Br(2) trigonal-bipyramidal geometry for the metal ion, with both bromide ions in equatorial sites. The dihedral angles between the pyrazine ring and the coordinated pyridine rings are 13.3 (2) and 24...

The asymmetric unit of the title compound, [MnI(C(24)H(16)N(6))(H(2)O)(2)]I·H(2)O, consists of a cationic Mn(II) complex, an I(-) anion and a solvent water mol-ecule. In the complex, the Mn(II) ion is six-coordinated in a considerably distorted octa-hedral environment defined by three N atoms of the tridentate 2,3,5,6-tetra-2-pyridyl-pyrazine (tppz) ligand, one I(-) anion and two O atoms of two...

The title complex, [Ni(C(24)H(32)N(4))](C(14)H(14)O(2)PS(2))(2), comprises a centrosymmetric [Ni(meso-diphen-yl[14]dien)](2+) dication (meso-diphen-yl[14]dien is C-meso-N-meso-5,12-dimethyl-7,14-diphenyl-1,4,8,11-tetra-aza-cyclo-tetra-deca-4,11-diene) and two O,O'-bis-(4-methyl-phen-yl) dithio-phosphate anions. The Ni(II) ion lies on an inversion center and is chelated by a tetra-amine macrocyc...

The title tetra-nuclear complex, [Cu(4)Cl(6)O(C(13)H(11)N(3))(4)], features a tetra-hedral arrangement of copper(II) ions bonded to the central O atom (site symmetry [Formula: see text]). Each of the six edges of the Cu(4) tetra-hedron is bridged by a chloride ion (one of which has site symmetry 2), so that each copper ion is linked to the other three metal ions through the central O atom and t...

The Cu(II) atom in the title salt, [Cu(C(10)H(24)N(4))(H(2)O)(2)][CH(3)(CH(2))(5)CO(2)](2)·2H(2)O, is chelated by the four N atoms of the 1,4,8,11-tetra-aza-cyclo-tetra-decane (cyclam) ligand and is coordinated by two water mol-ecules in a tetra-gonally Jahn-Teller-distorted octa-hedral geometry. The Cu(II) atom lies on a center of inversion. The cations, anions and uncoordinated water mol-ecul...

The title chain polymer compound, [GaLi(2)Br(C(3)H(9)OSi)(4)(C(4)H(8)O)(2)](n), was obtained in the reaction of GaBr(3) with Me(3)SiOLi in toluene/tetra-hydro-furan. The Ga(III) atom, located on a twofold rotation axis, is coordinated by four trimethyl-silanolate ligands and has a distorted tetra-hedral geometry. The Li(I) atom is four coordinated by one bridging Br atom located on an inversion...

The enzyme kinetics of hevamine, a chitinase from the rubber tree Hevea brasiliensis, were studied in detail with a new enzyme assay. In this assay, the enzyme reaction products were derivatized by reductive coupling to a chromophore. Products were separated by HPLC and the amount of product was calculated by peak integration. Penta-N-acetylglucosamine (penta-nag) and hexa-N-acetylglucosamine (...

A new mononuclear cobalt(II) complex, tetra-aqua-bis[5-(4-pyrid-yl)tetra-zolido-κN(5)]cobalt(II) dihydrate, [Co(C(6)H(4)N(5))(2)(H(2)O)(4)]·2H(2)O, has been synthesized and structurally characterized. The Co(II) atom is coordinated by two N atoms from 5-(4-pyrid-yl)tetra-zole ligands (L), as well as four O atoms from coordinated water mol-ecules. The mol-ecule is centrosymmetric, with pairs of ...

In the title complex, [Mn(C(10)H(7)N(6))(2)(H(2)O)(4)], the Mn(2+) cation is located on a twofold rotation axis and is coordinated by two N atoms from two 5-[4-(imidazol-1-yl)phen-yl]tetra-zolide ligands and four O atoms from four water mol-ecules, displaying a distorted MnN(2)O(4) octa-hedral geometry. The crystal structure is stabilized by intermolecular O-H⋯N hydrogen bonds involving the coo...