Effect of the acid-base interactions in a solution on the composition of the coordination sphere of aluminum and gallium complexonates

Hydroxocomplexonate K-2[GaEdta(OH)] . 6H(2)O (I) and nitronium salts BH(+)G aEdta . 4H(2)O (II) and BH(+)AlEdta . 4H(2)O (IV) are synthesized from aque ous solutions at pH 8, 6, and 7, respectively. AIHEdta(H2O) (III) is isolat ed from an acid solution (pH 1.5). Structures I, II, and IV are determined by single-crystal X-ray diffraction. The X-ray powder diffraction analysis of III has revealed that its crystals are not isostructural with those of s imilar complexes of other metals. Crystals I-IV are monoclinic. The unit ce ll parameters are a = 10.482(1), 15.735(4), 5.768(4), and 15.756(4) Angstro m; b = 10.442(2), 12.511(2), 14.884(11), and 12.453(3) Angstrom; c = 19.590 (4), 17.330(5), 19.113(12), and 17.328(6) Angstrom; beta = 101.30(2)degrees , 104.54(2)degrees, 90.74(5)degrees, and 104.75(2)degrees for I-IV, respect ively. (C) 2001 MAIK "Nauka/Interperiodica".