The new compound LaSr(3)F(5)(CN(2))(2) was prepared and structurally characterized as a prototype structure for the remarkably distorted mixed-valent compound Eu(4)F(5)(CN(2))(2), which contains four distinct europium ions in the structure: one Eu(3+) and three Eu(2+). Instead of repeating the given distorted structural pattern, LaSr(3)F(5)(CN(2))(2) forms a structure which can be considered as an ideal high-symmetry structure for Eu(4)F(5)(CN(2))(2), due to the occupation of La(3+) and Sr(2+) ions on one and the same crystallographic position. The crystal symmetry of this structure is an interesting issue to compare with what has been previously proposed.
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