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C36H44N4Ni3O20, orthorhombic, Pbcn (no. 60), a = 9.553(1) Å, b = 12.260(2) Å, c = 36.798(4) Å, V = 4309.8 Å, Z = 4, Rgt(F) = 0.059, wRref(F) = 0.144, T = 298 K. Source of material Reagents and solvents usedwere of commercially available quality. Salicylaldehyde (0.2 mmol, 24.5 mg) and aminoacetic acid (0.2 mmol, 15.1 mg) were dissolved in the mixture solution of methanol and water (20 ml, 2:1 v/v). The mixture was stirred for 30 min at room temperature. To the above solution was added with stirring an aqueous solution (5 ml) of nickel(II) nitrate hexahydrate (0.2mmol, 58.2mg). The finalmixturewas stirred at room temperature for another 30 min and filtered. Green needleshaped crystals suitable for X-ray structure determination were formed by slow evaporation of the solvent from the filtrate for 12 days. Experimental details TheH atoms of the water molecules were located in a Fourier difference map and refined isotropically, with OH distances restrained to 0.85(1) Å and H···H distances restrained to 1.37(2) Å. Other H atoms were positioned geometrically and constrained as riding atoms, with CHdistances of 0.93Å  0.97Å andUiso(H) set to 1.2Ueq(C) of the parent atoms. Discussion The design of multidentate ligands and their metallosupramolecular chemistry are of great interest in the last few years [1-3]. The condensation reaction of an aromatic carbaldehyde with a primary amine has been shown to offer an easy and inexpensiveway of forming a variety of polydentate Schiff base ligands. It has previously been shown that such ligands readily lead to the formation of diverse complexes [4-7]. The crystal structure of the title nickel(II) complex is isostructural with that of the cobalt complex reported previously [8]. The complex consists of a mononuclear Schiff base nickel(II) anionic moiety, a hexaaquanickel(II) cationic moiety, and a lattice water molecule. Both Ni atoms are six-coordinated in an octahedral environment. The Ni1 atom is coordinated by four O and two N atoms from two Schiff base ligands. The Ni2 atom is coordinated by six O atoms from six water molecules. The dihedral angle between the two benzene rings is 60.0(5)°. All the bond lengths and angles subtended at the metal centers are typical and comparable to those observed in other similar nickel(II) complexes [9-12]. The crystal structure is stabilized by intermolecular OH···O hydrogen bonds. Z. Kristallogr. NCS 222 (2007) 119-121 / DOI 10.1524/ncrs.2007.0047 119 © by Oldenbourg Wissenschaftsverlag, München Crystal: green needle, size 0.03 × 0.08 × 0.45 mm Wavelength: Mo K radiation (0.71073 Å) : 13.81 cm−1 Diffractometer, scan mode: Siemens P4, 2 max: 53° N(hkl)measured, N(hkl)unique: 32789, 4464 Criterion for Iobs, N(hkl)gt: Iobs > 2 (Iobs), 3152 N(param)refined: 309 Programs: SHELXS-97 [13], SHELXL-97 [14] Table 1. Data collection and handling.

Crystal structure of hexaaquanickel(II) bis(bis(N-salicylideneglycinato- O,O′)nickelate(II)) dihydrate, [Ni(H 2 O) 6 ][Ni(C 9 H 7 NO 3 ) 2 ] · H 2 O