The crystal structure of H(3)BO(3)-3T, a new trigonal polytype of orthoboric acid, consists of sheets of hydrogen-bonded B(OH)(3) molecules similar to those found in the triclinic structure of orthoboric acid, H(3)BO(3)-2A. In each case, van der Waals forces connect the sheets. However, the stacking sequences of the sheets differ between the two polymorphs. In H(3)BO(3)-3T (space group P3(2)), the sheets are stacked in the repeating sequence ABC em leader, whereas in H(3)BO(3)-2A (space group P-1, the sheets are stacked in the repeating sequence AB em leader.
Diaquadinitratouranyl(VI) monohydrate is monoclinic (space group P2(1)/c), in contrast to its triclinic polymorph. The main building block of the structure is the finite non-centrosymmetric [UO(2)(NO(3))(2)(H(2)O)(2)] cluster, which is a uranyl hexagonal bipyramid that shares two non-opposite equatorial edges with the nitrate triangles, such that the two water molecules are at neighbouring equatorial vertices. There is an interstitial water site in the structure, which is located between adjacent [UO(2)(NO(3))(2)(H(2)O)(2)] clusters.
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