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SrC 4 O 4  ·3 H 2 O, type III. was obtained in an aqueous silica gel besides crystals of SrC 4 O 4 -3 H 2 0. type I. X-ray crystal structure analysis showed close relationship to BaC 4 O 4 -3H 2 0. but no isotypism. Sr 2+  is coord|inated by four water molecules and four oxygen atoms of the squarate dianion. The connection of Sr 2+  with C 4 O 4  2-  leads to layers. The geometry of C 4 O 4  2-  is typical for delocalized π-systems. The O squarate  atoms are not equally bound to Sr 2+ . One O squaralc  atom (0(4)) is bound to two Sr 2+ , two (O(1). O(2)) are bound to one Sr 2+ , respectively, and the fourth O squaratc  atom (0(3)) shows no bonding contact to Sr 2+ . These differences are compensated for by intermolecular hydrogen bonds which involve O(3) three times, O( I) and O(2) once each, but not O(4).

Erdalkaliquadratate, VI [1] SrC 4 O 4 · 3H 2 O, Typ III / Alkaline-earth Squarates, VI [1] SrC 4 O 4 ·3H 2 O, Type III