Lars Olof Larsson

First case of an eleven-co-ordinated trivalent lanthanoid: X-ray crystal structure of penta-aquatri(nitrato)lanthanum(III) monohydrate

In the structure of [La(NO3)3(H2O)5]·H2O (determined by X-ray crystallography) the lanthanum atom is surrounded by three bidentate nitrate ligands and five water molecules; this result indicates a hitherto unknown co-ordination number of eleven for a trivalent lanthanoid.

A method for the preparation of heavy-atom derivatives of yeast cytochrome c peroxidase.

Abstract This Letter describes a strategy for preparation of heavy-atom derivatives which has succeeded with yeast cytochrome c peroxidase and which may be useful for other crystalline proteins. Transfer of the crystals from methylpentanediol solutions, in which they were grown, to solutions of polyethylene glycol ( M r 6000) maintains the crystal structure so that crystals tolerate heavy-atom concentrations at least ten times larger than could be attained in methylpentanediol mother liquors.