The vibrational spectrum of molecular propanoic acid, cooled in a supersonic expansion, in the region of 2500 to 7500 cm(-1) is obtained employing infrared plus vacuum ultraviolet nonresonant ionization detected spectroscopy. The fundamental and first overtone of the CH and OH stretch modes of cold propanoic acid molecules can be identified in the spectrum. Propanoic acid neutral and ionic clus...

In the title compound, C(20)H(22)N(2)O, both cyclo-hexane rings adopt chair conformations. Weak C-H⋯N and C-H⋯O hydrogen bonding is present in the crystal structure.

In the crystal structure of title salt, C(10)H(16)N(+)·Cl(-), the amino H atoms are involved in inter-molecular N-H⋯Cl hydrogen bonding, generating a zigzag chain propagating in [100].

In the title compound, C(19)H(18)FN(3)O(4), the fused pyridine and pyrimidine rings adopt half-chair conformations. The structure displays intra-molecular N-H⋯O and inter-molecular N-H⋯F hydrogen bonding.

In the organic molecule of the title compound, C(16)H(10)O(8)·H(2)O, the dihedral angle between the two benzene rings is 42.30 (11)°. Extensive O-H⋯O hydrogen bonding helps to stabilize the crystal structure.

The mononuclear title complex, [Zn(C(22)H(15)O(5))(2)(C(2)H(5)OH)(2)], contains a Zn(II) atom (site symmetry ) surrounded by six O atoms of the keto groups of two substituted 1,3-diketonate ligands and of two ethanol mol-ecules, resulting in a distorted octa-hedral coordination environment. The mol-ecular configuration is stabilized by an intra-molecular hydrogen bond between the phenolic hy-dr...

A novel mixed-ligand zinc(II) complex with iminodiacetato(2-) (IDA) and adenine (AdeH) ligands has been obtained. Its crystal consists of octahedral molecules [Zn(IDA)(AdeH)(H2O)2] where the selective Zn–N9(AdeH) bond, involving the most basic N(AdeH) donor atom, occupies the trans position versus the Zn–N(IDA) bond. The Zn(II)–N9(AdeH) binding mode seems to be rare enough in comparison to thos...

OBJECTIVES The aim of this study was to test the null hypothesis that the tensile properties of demineralized dentin are not influenced by the hydrogen bonding ability of anhydrous polar solvents. METHODS Dentin disks 0.5mm thick were prepared from mid-coronal dentin of extracted, unerupted, human third molars. 'I' beam and hour-glass shaped specimens were prepared from the disks, the ends pr...

The report by Kubas and co-workers in 1984 of a metal complex with dihydrogen as a ligand heralded the advent of a new era in organometallic and inorganic chemistry. Hydrogenations are a cornerstone of homogeneous catalysis, so reactions of metal complexes with H2 had been studied for decades, but the idea that H2 could bind to the metal as a ligand, without complete cleavage of the H H bond to...