Photoactivation of the water splitting enzyme was performed with 13 different synthetic manganese complexes and characterized by oxygen evolution yield, thermoluminescence and chlorophyll fluorescence induction kinetics. The efficiency of different compounds in photoactivation correlated with the rate of linear electron transport in the presence of these compounds. The organic ligands, associat...

In the structure of the title complex, [Zn(C8H14N6S2)(C5H5N)], the Zn(II) ion has a pseudo-square-pyramidal coordination environment and is displaced by 0.490 Å from the plane of best fit defined by the bis-(thio-semicarbazonate) N2S2 donor atoms. Chains sustained by intermolecular N-H⋯N and N-H⋯S hydrogen-bonding interactions extend parallel to [10-1].

In the title mononuclear copper(II) complex, [Cu(C(7)H(5)ClNO)(2)], the Cu atom, situated on an inversion center, is four-coordinated, in a slightly distorted square-planar geometry, by the N- and O-donor atoms of two symmetry-related 4-chloro-2-(imino-meth-yl)phenolate Schiff base ligands.

The title compound, C(13)H(13)NO(4)S, is a racemic mixture of enanti-omers. Short intra-molecular contacts between sulfonyl O and ester carbonyl C atoms are observed [C⋯O = 2.881 (1), 2.882 (1) and 2.686 (1) Å], indicating the possibility of donor-acceptor inter-actions between these groups. The dihedral angle between the phenyl and cyclopropyl rings is 79.3 (1)°.

A tripodal amido ligand with a central non-chelating phosphorus donor allows for the facile assembly of a pentane soluble organometallic copper cluster with a central copper atom surrounded by a nonplanar chain of eight copper atoms and two terminal amido-copper bonds.

An analysis of hydrogen bonds involving ester Osp3 atoms as acceptors has been performed based on the data extracted from the Cambridge Structural Database [Allen (2002). Acta Cryst. B58, 380-388; version 5.25, November 2003], using the ConQuest package to evaluate the stereochemical and electronic properties of the acceptors. Evidence for the existence of this particular type of hydrogen bond ...

Isotropic and anisotropic chemical shifts for all atoms of complexes CH3HO . . . H2O and CH3OH . . . OH2 have been calculated at the Hartree–Fock, secondorder Møller-Plesset (MP2) and density functional (B3LYP) theoretical levels using the 6-311 G(2d,2p) basis set. The influence of the hydrogen bond formation on the nuclear magnetic resonance chemical shifts in all atoms is analyzed. The basis ...

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The title compound, C(20)H(20)N(4)O, is packed into a three-dimensional 'herringbone' matrix using two different types of attractive C-H⋯N(cyano) inter-actions. The bond-length alternation, caused by delocalization of charge between the donor N atoms and the cyano acceptor groups, is compared with related compounds.

derivatives, a weak intermolecular donor-acceptor (D-A) interaction between the quinone (A) and the benzene or methylsubstituted benzene (D) moieties contributes to connect the molecules to a ribbon-like supramolecular unit.1,2 It seems reasonable that the benzene moiety substituted by methyl groups, which is better donor, tend to participate in the D-A interaction preferentially, for example i...