Abstract
Single crystals of potassium hydrogen squarate monohydrate have been prepared, and the unit cell, space group and crystal optics determined:a = 8·641(1),b = 10·909(1),c = 6·563(2)A, β = 99·807(5) °,Z = 4,P21/c,nα = 1·411(1),nβ = 1·674(1),nγ = 1·793(2), 2V(−) = 59·1(8) °,nγ ¦¦t,nβ:a = 2·3(2) ° in obtuse β. Infrared and oriented Raman spectra have been obtained, and compared with the spectra of both the acid and the [C4O4]2− ion. The squarate ring is itself very nearly orthorhombic, with symmetry axes parallel to the C-C bonds. The rings lie approximately in (001), with the C-C bonds aligned witha andb.
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