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The crystal structures of three indium(lll) complexes with nitrilotriacetate (nta) have been determined. Crystallographic data for the compounds are as follows: [ln(nta)(H20)2] n .2nH20(1), orthorombic, space group P2 1 2 1 2 1 , a = 7.870(1), b = 11.505(2), c = 13.721(3) A, V = 1242.4(4) A 3 and Ζ = 4; Κ 3 [Ιη(ηί3) 2 ].5Η2θ (2), monoclinic, space groupP2i/c, a = 15.599(4), b = 9.814(2), c = 16.057(4) Α, β = 110.00(2)°, V = 2310(1) A 3 and Ζ = 4; {C(NH 2 )3}3[ln(nta) 2 ].2H 2 0 (3), triclinic, space group ΡΪ a = 9.517(3), b = 9.717(2), c = 15.306(4) Α, α = 76.17(2), β = 89.47(2), γ = 88.75(2)°, V = 1374.1(6) A 3 and Ζ = 2. In the polymeric-chain structure of 1 the In atom is seven-coordinated by two water molecules and nta 3 ", the latter being quadridentate towards one indium and forming bridges between two metal centres, whereas compounds 2 and 3 have monomeric structure with eight-coordinate complex anions containing two quadridentate nta ligands. The coordination geometry around the In atom is: a trigonal prism capped on a square face (1), a nearly ideal dodecahedron (2) and a highly distorted tetragonal antiprism (3).

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