We describe ZRL1, a turn-on colorimetric and red fluorescent zinc ion sensor. The Zn(2+)-promoted ring opening of the rhodamine spirolactam ring in ZRL1 evokes a 220-fold fluorescence turn-on response. In aqueous media, ZRL1 turn-on luminescence is highly selective for Zn(2+) ions, with no significant response to other competitive cations, including Na(+), K(+), Ca(2+), Mg(2+), Mn(2+), Fe(2+), ...

The title one-dimensional coordination polymer, [ZnCl(2)(C(10)H(14)N(4))](n), was synthesized by hydro-thermal methods from ZnCl(2) and 1,1'-(butane-1,4-di-yl)diimidazole. The Zn atom is coordinated by two chloride ions and two N atoms from two symmetry-independent organic ligands and shows a distorted tetra-hedral coordination geometry. The 1,1'-(butane-1,4-di-yl)diimidazole ligands are locate...

Upon expression and purification of the first catalytic domain of mammalian adenylate cyclase type 1 (IC1), a 27 kDa contaminant was observed, which was labelled by three radioactive ATP analogues (8-azido-ATP, 3'-O-(4-benzoyl)benzoyl-ATP and 2',3'-dialdehyde-ATP); the protein was purified separately and identified as Escherichia coli SlyD by N-terminal amino acid sequence determination. SlyD i...

A poly(amine ester) dendrimer with naphthyl units (G1N6) has been synthesized as a fluorescent chemosensor for metal ions. We investigated the metal-ion recognition of G1N6 by adding each of Ag(+), Al(3+), Ba(2+), Ca(2+), Cd(2+), Co(2+), Cu(2+), Fe(3+), Mg(2+), Ni(2+), and Zn(2+) in acetonitrile solution. Large changes were observed in the fluorescence spectra of G1N6 upon the addition of Al(3+...

Side-chain functionalized poly(p-phenylene ethynylene)s (PPEs) carrying triazole linkers, amino donors/receptors, and solubilizing groups have been found to yield remarkably high efficiency of fluorescence turn-on sensing for Zn(2+) and Cd(2+) ions in THF, and for H(+) and Cd(2+) ions in water.

Four isostructural LnZn2 trinuclear complexes, [Ln(NO3){Zn(L)(SCN)}2] (H2L is a Schiff base ligand derived from o-vanillin and ethylenediamine), were synthesized, which include light lanthanide ions as spin carriers (Ln = Ce 1, Pr 2, Nd 3, and Sm 4). These complexes involve a linear Zn(ii)-Ln(iii)-Zn(ii) array, which leads to an axially stressed ligand field and can also cause single-moleluce m...

The real dielectric constant e' and loss factor tan were studied as function of frequency J, temperature T and composition x for a series of samples of BaCo2~Zn~Fe12-2~ Dig hexagonal ferrite system with x = 0A, 0.8, 12, 16 and 2 prepared using the usual ceramic technique. The experimental results indicated that e' and tan decrease as the frequency increases and temperature decreases The studied...

The central part of the title centrosymmetric dinuclear complex, [Zn(2)(C(7)H(5)O(2))(4)(C(9)H(12)N(2))(2)], has a paddle-wheel conformation with four benzoate ligands bridging two symmetry-related Zn(II) ions. The distorted square-pyramidal coordination environment around the Zn(II) ion is completed by an N atom from a 4-(pyrrolidin-1-yl)pyridine ligand. The Zn⋯Zn separation of 2.9826 (12) Å d...

Here, we used stopped-flow fluorescence techniques to conduct a comparative kinetic analysis of the conformational transitions in human apurinic/apyrimidinic endonuclease 1 (APE1) and in DNA containing an abasic site in the course of their interaction. Effects of monovalent (K(+)) and divalent (Mg(2+), Mn(2+), Ca(2+), Zn(2+), Cu(2+), and Ni(2+)) metal ions on DNA binding and catalytic stages we...

Metal ions can significantly expand the scope of macromolecular catalysis. For catalysts composed of nucleic acids (DNA or RNA), metal ions are typically required for both structural and catalytic roles. Divalent metal ions such as Mg, Mn, and Zn are often, but not always, obligatory cofactors for ribozymes and deoxyribozymes. We recently described the 10MD5 deoxyribozyme as an example of a hig...