Reactions of monovalent ions with a versatile building block [Cr(phen)(C2O4)2]-. Molecular and crystal structures of NaCr(phen)(C2O4)2·3H2O, KCr(phen)(C2O4)2·DMF·0.5H2O, 4-NH3py[Cr(phen)(C2O4)2]·2H2O, N-(n-butyl)4[Cr(phen)(C2O4)2], and PPh4[Cr(phen)(C2O4)2]

The molecular and crystal structures of the products of the reaction between the building block [Cr(phen)2(C2O4)2)]- and several monovalent ions, two from the alkaline group (Na+, K+) and 4-NH3pyridine+, N-(n-butyl)4+, and PPh4+ were studied by crystallographic methods. Na(Cr(phen)2(C2O4)2)·3H2O (1) is monoclinic, P21/c,a = 9.129(2), b = 13.867(2), c = 17.934(5) A, β= 117.52(2)°, Z = 4 and R = 0.0623. The sodium atom is surrounded by six oxygen atoms at distances between 2.363(6) and 2.484(8) A. The Na···Na distance is 3.693(7) A. The compound has an extended structure forming layers, held together by H bonds. K(Cr(phen)2(C2O4)2)·DMF·0.5H2O (2) is monoclinic, P21/n,a = 11.298(2), b = 14.048(5), c = 14.240(5) A, β= 108.19(2)°, Z = 4 and R = 0.0647. The material also possesses an extended 2D structure, but quite different from the one of the sodium compound. The coordination number around the K atom is 6 with K-O distances between 2.663(13) and 2.920(9) A. The K···K distance is 3.939(9) A. The other crystal...