In the cation of the title salt, C(24)H(24)N(7) (3+)·3C(6)H(2)N(3)O(7) (-)·2C(2)H(3)N, the three benzimidazolium ring systems are oriented to each other at dihedral angles of 10.42 (7), 23.98 (7) and 22.17 (7)°. In the crystal, the cation links to the adjacent picrate anions via N-H⋯O hydrogen bonds; one of independent acetonitrile solvent mol-ecules is also linked to the cation via an N-H⋯N hy...

The negative interference by bilirubin in the measurement of creatinine by the Jaffé procedure is well documented. We describe a procedure for the elimination of interfering bilirubin by oxidation to biliverdin through the addition of potassium ferricyanide before the alkaline picrate reagent. We detected no negative interference with the addition of as much as 600 mumol/L bilirubin. The proced...

In the title salt, C(12)H(12)N(3) (+)·C(6)H(2)N(3)O(7) (-), the diazenyl group of the 4-(phenyl-diazen-yl)aniline mol-ecule is protonated and forms a hydrogen bond with the phenolate O-atom acceptor of the picrate anion. Structure extension occurs through two symmetrical inter-ion three-centre amine N-H⋯O,O'(nitro) hydrogen-bonding associations [graph set R(1) (2)(4)], giving a convoluted two-d...

The carrier facilitated transport of lithium picrate was studied using a series of non-cyclic polyethers containing different end groups and chain lengths through Bulk Liquid Membrane (BLM) and Supported Liquid Membrane (SLM) systems. The various membrane supports used are viz. PTFE, cellulose nitrate, and dialysis membrane and onion membrane. The amount of Li+ transported depends upon the stru...

The title compound, C(18)H(12)N(6)O(6), was prepared from the reaction of 4-(phenyl-diazen-yl)aniline (aniline yellow) with picryl-sulfonic acid. The dihedral angle formed by the two benzene rings of the diphenyl-diazenyl ring system is 6.55 (13)° and that formed by the rings of the picrate-aniline ring system is 48.76 (12)°. The mol-ecule contains an intra-molecular aniline-nitro N-H⋯O hydroge...

Phenacemide and cephalothin may interfere either positively or negatively with the determination of creatinine by the Jaffé reaction, depending on the analytical system. The drug-picrate chromophores maximally absorb within the first minute of reaction (21 s for phenacemide, 45 s for cephalothin), after which the absorbances decrease. Thus, these drugs negatively interfere in analytical systems...

The crystal structure of the title compound, [Cd(C(29)H(29)N(5))(2)](C(6)H(2)N(3)O(7))(2), consists of Cd(II) complex cations and picrate anions. In the complex cation, the Cd(II) ion is chelated by two bis-(1-allyl-benzimidazol-2-ylmeth-yl)benzyl-amine (babb) ligands in a distorted octa-hedral geometry. Extensive C-H⋯O hydrogen bonding occurs between cations and anions in the crystal structure.

In the title compound, [Mn(H(2)O)(6)](C(6)H(2)N(3)O(7))(2)·2H(2)O, the manganese cation, on an inversion centre, is coordinated by six water mol-ecules, but the picrate anion has no coordinative inter-action with the manganese cation. The anions in the stack are linked via short inter-molecular O⋯C (3.013 and 2.973 Å) and C⋯C (3.089 and 3.065 Å) contacts and hydrogen bonds.

In the title compound, [Zn(C(21)H(17)N(5))(2)](C(6)H(2)N(3)O(7))(2)·2CH(3)OH, the Zn(II) atom is coordinated by six N atoms from two tridentate 2,6-bis-(1-methyl-1H-benzimidazol-2-yl)pyridine ligands in a distorted octa-hedral environment. In the crystal, the picrate anions and methanol solvent mol-ecules are connected by O-H⋯O hydrogen bonds. Weak inter-molecular C-H⋯O hydrogen bonds are also ...

The mol-ecule of the title complex, [Cu(C(6)H(2)N(3)O(7))(2)(C(3)H(7)NO)(2)], is disposed about a crystallographic centre of symmetry. The Cu(II) cation is six-coordinated by two phenolate O atoms and two ortho-nitro O atoms of two picrate units and by two carbonyl O atoms from two coordinated dimethyl-formamide mol-ecules, forming a distorted octa-hedral geometry.