J. Appl. Cryst.の発刊に際して

Although homogeneous gold catalysis was known previously, an exponential growth was only induced 12 years ago. The key findings which induce that rise of the field are discussed. This includes early reactions of allenes and furanynes and intermediates of these conversions as well as hydroarylation reactions. Other substrate types addressed are alkynyl epoxides and N-propargyl carboxamides. Important vinylgold intermediates, the transmetalation from gold to other transition metals, the development of new ligands for gold catalysis, and significant contributions from computational chemistry are other crucial points for the field highlighted here.

Gold-Catalyzed Organic Reactions

This critical review presents a comprehensive study of transition-metal carboxylate clusters which may serve as secondary building units (SBUs) towards construction and synthesis of metal–organic frameworks (MOFs). We describe the geometries of 131 SBUs, their connectivity and composition. This contribution presents a comprehensive list of the wide variety of transition-metal carboxylate clusters which may serve as secondary building units (SBUs) in the construction and synthesis of metal–organic frameworks. The SBUs discussed here were obtained from a search of molecules and extended structures archived in the Cambridge Structure Database (CSD, version 5.28, January 2007) which included only crystals containing metal carboxylate linkages (241 references).

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Secondary building units, nets and bonding in the chemistry of metal–organic frameworks

Interpretation of X-ray Powder Diffraction Patterns . By H. Lipson and H. Steeple. Pp. viii + 335 + 3 plates. (Mac-millan: London; St Martins Press: New York, May 1970.) £4.

X-Ray Diffraction

Cyanines during the 1990s: A Review

In the title compound, [Au(C14H8NO2)(C18H15P)], the AuPPh3 group is located at the amino group. The Au—N and Au—P distances are 2.019 (3) and 2.2420 (8) A. The amino group H atom is involved in the intramolecular hydrogen bond with a carbonyl O atom. The bond length distribution in the aminoanthraquinone ligand is slightly different from that in the free ligand, manifesting itself as a more pronounced contribution from the quinoid structure.

(9,10-Dioxo-9,10-dihydro-1-anthrylaminato-N)(triphenylphosphine-P)gold

Two isomers, p-butoxyphenyl p′-hexyloxybenzoate (1) and p-hexyloxyphenyl p′-butoxybenzoate (2), are studied by X-ray diffraction. Crystals 1 contain two crystallographically independent molecules, which differ in the conformation of one of their side chains. In both compounds, bond lengths and angles have standard values. The geometry of the central fragment Ph-Est-Ph is essentially the same in both isomers. One of the benzene rings is coplanar with the Est group, and the other ring, which is linked with this group through the oxygen atom, is almost perpendicular to the Est plane. In crystal 1, molecules are packed in such a fashion that, in any pair of neighboring molecules, the most closely spaced benzene rings are nearly perpendicular to each other, which corresponds to a weak C-H⋯π interaction. In the crystal packing of 2, neither perpendicular nor stacking motifs are observed. The supramolecular architecture of this compound is determined by directional specific interactions of the hydrogen bond type between the C-H benzene fragment and the ester oxygen atom of the neighboring molecule.

Molecular and crystal structures of mesomorphic aromatic esters: I. Structure of two isomers, p -butoxyphenyl p ′-hexyloxybenzoate and p -hexyloxyphenyl p ′-butoxybenzoate

Novel Titanium (IV) Diolate Complexes with Thiophene-Containing OSO-type ligand as pre-catalyst for Ethylene polymerization and Ethylene - Propylene copolymerization

An unusual isomorphism of 18-crown-6 hydrazine disolvate C12H24O6·2N2H4 (1) and 18-crown-6 tetrahydrate (2) is observed. The isomorphous substitution of hydrazine by water molecules is found for the first time in the structures of tetrabutylammonium acetate hydrazine solvates hydrous Bu4N+AcO−·0.9(N2H4)·0.1(H2O) (3) and anhydrous Bu4N+AcO−·N2H4 (4). Surprisingly, the nature of these isomorphous relationships is completely different from the well-known isostructurality of organic hydrogen peroxide/water solvates.

Andrei V. Churakov

Papers

(9,10-Dioxo-9,10-dihydro-1-anthrylaminato-N)(triphenylphosphine-P)gold

Molecular and crystal structures of mesomorphic aromatic esters: I. Structure of two isomers, p -butoxyphenyl p ′-hexyloxybenzoate and p -hexyloxyphenyl p ′-butoxybenzoate

Novel Titanium (IV) Diolate Complexes with Thiophene-Containing OSO-type ligand as pre-catalyst for Ethylene polymerization and Ethylene - Propylene copolymerization

Unusual isomorphism in crystals of organic solvates with hydrazine and water

First asymmetric synthesis of 3-methyltetrahydroquinolin-4-ones from anilines