In the title compound, [CrF(C(8)H(20)N(4))(H(2)O)](ClO(4))(2)·H(2)O, the Cr atom is in a slightly distorted octa-hedral environment, coordinated by four N atoms of the 4,7-diaza-decane-1,10-diamine ligand, one water mol-ecule and an F atom trans to water. The five-membered chelate ring is in a gauche form, while the two six-membered chelate rings are in chair conformations. The crystal structur...

6. Stewart, I. and C. D. Leonard. 1957. Use of chelates in citrus production in Fla. Soil Sci. 84: 87-98. 7. Wallace, A. 1956. Differential availability of micronutrients in the soil following chelate applications. Sym posium on the use of metal chelates in plant nutrition. National Press, Palo Alto, Calif, pp. 44-48. 8. Wallace, A. 1956. Metal chelates in agriculture. Symposium on the use of m...

The principles and practice of the application of time-resolved lanthanide chelate luminescence (or fluorescence) as a detection method for ultrasensitive bioanalytical assays such as immunoassays and nucleic acid hybridization assays are reviewed. The various lanthanide chelate-based detection systems which have been developed for use in heterogeneous and homogeneous assay formats are describe...

The Ni atom in the title complex, (C(24)H(20)P)(2)[Ni(C(9)H(17)NO(2)S(3))(2)], lies on a twofold axis within a square-planar geometry defined by four S atoms derived from two dithio-carbimate dianions, each forming a four-membered chelate ring. A small distortion, described by a deviation of the Ni(II) atom by 0.083 (1) Å from the plane through the four S atoms, and also by the torsion angles a...

Introduction: Gadoxetic acid (Gd-EOB-DTPA) is a recently approved contrast agent which has hybrid properties of hepatocyte specific and extracellular, enabling the evaluation of both tissue perfusion and hepatobiliary excretion. Dynamic first-pass enhancement pattern has been the key word for HCC. However, we have been familiar with that using standard Gd-chelate agents. The purpose of our stud...

A new time-resolved fluorescence immunoassay system involving use of the europium chelate of 4,7-bis(chlorosulfophenyl)-1,10-phenanthroline-2,9-dicarboxylic acid as label is reviewed. This stable chelate by itself is not very fluorescent but, used in multiple labeling strategies, improves the achievable detection limits. By using multiple labeling, streptavidin tailing, and Eu3+ activation, one...

The molecular structure of the title compound, [ZnBr(2)(C(10)H(8)N(2)S(2))], contains a seven-membered chelate ring in which the zinc atom is coordinated by two bromide ions and by the two pyridyl N atoms of a single 2,2'-dipyridyldisulfide (dpds) ligand within a slightly distorted tetra-hedron. As is usual for this type of complex, the disulfide group does not participate in zinc coordination....

The co-extraction phenomenon was found in a typical chelate extraction system, in which the extraction of lanthanoid ion (Ln3+) with acetylacetone (Hacac) was highly enhanced by various metal ions (M(n+)) such as Cu2+, Al3+, and Zr4+. This phenomenon was ascribed to the formation of the 1:1 adduct between Ln(acac)3 and the M(acac),, extracted into the organic phase. The co-extraction occurred m...

The ketoenamine-enolimine tautometic equilibrium has been studied by the analysis of aromaticity and electron-topological parameters. The influence of substituents on the energy of the transition state and of the tautomeric forms has been investigated for different positions of chelate chain. The quantum theory of atoms in molecules method (QTAIM) has been applied to study changes in the electr...