Pseudotenfold symmetry in pentane-solvatedC60andC70

Pentane-1,5-diammonium tetra­chlorido­palladate(II)

In the title compound, [NH(3)(CH(2))(5)NH(3)][PdCl(4)], the square-planar [PdCl(4)](2-) anions are centrosymmetric while the diammonium cation lies in a general position. In addition to electrostatic inter-actions, the two species are linked through N-H⋯Cl hydrogen bonds to form a three-dimensional network.

3-(3-Nitro­benzyl­idene)pentane-2,4-dione

In the title mol-ecule, C(12)H(11)NO(4), the two acetyl C-C=O planes are inclined to the benzene ring at angles of 18.03 (8) and 80.75 (7)°. In the crystal, adjacent mol-ecules are linked into centrosymmetric dimers by pairs of C-H⋯O inter-actions.

Symmetry of Fullerene C_60

3-(Pyridin-4-yl­thio)­pentane-2,4-dione

In the title compound, C(10)H(11)NO(2)S, the acetyl-acetone group crystallizes in the keto form with all the non-hydrogen atoms in the acetyl-acetone group approximately co-planar with a maximum atomic deviation 0.055 (2) Å; the dihedral angle between the acetyl-acetone group and the pyridine ring is 85.90 (6)°. An intra-molecular O-H⋯O hydrogen bond involving the acetyl-acetone group forms a s...

Cystic fibrosis, breath pentane, and lipid peroxidation.

SIR,-Dr Weitz and colleagues (April 20, p 933) report the value of breath pentane analysis as an index of increased lipid peroxidation in vivo. However, Weitz et al fail to indicate the potential shortcomings of the method, as we are beginning to see in the context of cystic fibrosis. We have found that techniques involving hydrocarboncontaminated inspired air, as used by Weitz et al, produce u...