The asymmetric unit of the title compound, [Fe(C(9)H(4)O(6))(C(12)H(8)N(2))(H(2)O)](n), contains one Fe(II) cation, one 5-carboxy-benzene-1,3-dicarboxyl-ate dianion (Hbtc), one 1,10-phenanthroline (phen) ligand and one water mol-ecule. The Fe(II) centre displays a distorted octa-hedral geometry, being surrounded by one phen ligand, two μ(2)-O atoms of two carboxyl-ate groups from two Hbtc ligan...

A group of enzymes, mostly hydrolases or certain transferases, utilize one or a few side-chain carboxyl groups of Asp and/or Glu as part of the catalytic machinery at their active sites. This review follows mainly the trail of studies performed by the author and his colleagues on the structure and function of such enzymes, starting from ribonuclease T1, then extending to three major types of ca...

In the structure of the title hydrated salt, 2CH(6)N(3) (+)·C(8)H(2)Cl(2)O(4) (2-)·H(2)O, the planes of the carboxyl-ate groups of the dianion are rotated out of the plane of the benzene ring [dihedral angles = 48.42 (10) and 55.64 (9)°]. A duplex-sheet structure is formed through guanidinium-carboxyl-ate N-H⋯O, guanidinium-water N-H⋯O and water-carboxyl-ate O-H⋯O hydrogen-bonding associations.

In the gas phase the carboxyl group of an n-carboxylic acid molecule may adopt a number of different conformations. Upon adsorption on a solid surface, however, the carboxyl group usually assumes one of two possible configurations. Atomically resolved STM images show that the conformations of the carboxyl groups in 12-bromododecanoic acid and 2-bromohexadecanoic acid molecules differ when adsor...

In the title 1:1 silver(I) 4-carb-oxy-pyridine-3-carboxyl-ate adduct with triphenyl-phosphine, [Ag(C(7)H(4)NO(4))(C(18)H(15)P)](n), the carboxyl-ate anion bridges the phosphine-coordinated Ag atoms through its N and O atoms, generating a coordination polymer forming layers in the bc plane. The Ag atom exists in a distorted tetra-hedral geometry. The H atom of the carboxyl-ate is midway between ...