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C12H16Cl2MnN4O4, monoclinic, P121/c1 (no. 14), a = 14.6283(7) Å, b = 13.9519(6) Å, c = 8.7216(4) Å, * = 101.565(1)°, V = 1743.9 Å, Z = 4, Rgt(F) = 0.039, wRref(F ) = 0.108, T = 200 K. Source of material To a solution of MnCl2 · 4H2O (1.00 g, 5.05 mmol) in H2O (5 ml) was added syn-2-pyridinealdoxime (1.86 g, 15.23 mmol) in EtOH (55 ml) and stirred for 2 h at room temparature. The solvent was removed under vacuum, the residue was washed with ether, and dried, to give a pale yellow powder (1.79 g). Crystals suitable for X-ray diffraction analysis were obtained by slow evaporation from a CH3CN solution. Experimental details Hydrogen atoms were positioned geometrically and allowed to ride on their parent atoms with d(C—H) = 0.95 Å, d(O—H) = 0.84 Å and Uiso(H) = 1.2 Ueq(C) or 1.5 Ueq(O). Discussion The crystal structure of the title compound consists of the neutral complex [MnCl2(C6H6N2O)2] and two uncoordinated water molecules. In the complex, the central Mn(II) ion has a distorted octahedral coordination defined by four N atoms of the two chelating 2-pyridinealdoxime ligands and two Cl anions. The main contribution to the distortion is the tight N–Mn–N chelate angles (71.13(9)° and 71.59(8)°), which results in non-linear trans axes (∠Cl1–Mn1–N1 = 165.83(6)°, ∠Cl2–Mn1–N4 = 168.56(6)° and ∠N2–Mn1–N3 = 160.88(8)°). Moreover, the Cl-Cl repelling is present (∠Cl1–Mn1–Cl2 = 96.99(3)°), which also contributes to the distortion. The bond lengths Mn—Npyridine and Mn—Noxime are nearly equivalent with d(Mn—Npyridine) = 2.322(2) Å and 2.260(2) Å and d(Mn—Noxime) = 2.322(2) Å and 2.342(2) Å. The complex displays intermolecular --interactions between adjacent pyridine rings. For Cg1 (the centroid of ring N3-C11) and Cg1 (symmetry code i: –x,1–y,–z), the centroid-centroid distance is 3.993(2) Å, the planes are parallel and shifted for 1.880 Å. All H atoms on the O atoms participate in intermolecular O–H···O or O–H···Cl hydrogen bonds with d(O···O) = 2.605(3) 2.816(4) Å and d(O···Cl) = 3.017(3) 3.213(3) Å. Z. Kristallogr. NCS 225 (2010) 651-652 / DOI 10.1524/ncrs.2010.0284 651 © by Oldenbourg Wissenschaftsverlag, München Crystal: yellow block, size 0.24 × 0.31 × 0.38 mm Wavelength: Mo K+ radiation (0.71073 Å) .: 10.85 cm−1 Diffractometer, scan mode: Bruker SMART 1000 CCD, #/% 2,max: 56.58° N(hkl)measured, N(hkl)unique: 12494, 4288 Criterion for Iobs, N(hkl)gt: Iobs > 2 )(Iobs), 3184 N(param)refined: 210 Programs: SHELXS-97, SHELXL-97 [1], ORTEP [2], PLATON [3] Table 1. Data collection and handling. H(1A) 4e 0.3839 0.6428 0.6305 0.082 H(2A) 4e 0.1753 0.4880 0.7253 0.081 H(1) 4e 0.2314 0.2575 0.3041 0.052 H(2) 4e 0.3129 0.1169 0.3771 0.064 H(3) 4e 0.4526 0.1233 0.5614 0.069 H(4) 4e 0.5077 0.2721 0.6611 0.061 H(6) 4e 0.4900 0.4493 0.6690 0.047 H(7) 4e 0.1646 0.4357 0.0142 0.043 H(8) 4e 0.0305 0.3748 −0.1458 0.048 H(9) 4e −0.0916 0.3212 −0.0316 0.051 H(10) 4e −0.0758 0.3285 0.2404 0.047 H(12) 4e 0.0185 0.3755 0.5030 0.044 H(3A) 4e 0.7303 0.1294 0.7064 0.098 H(3B) 4e 0.7159 0.0715 0.5861 0.098 H(4A) 4e 0.6939 0.2084 0.3249 0.103 H(4B) 4e 0.7443 0.2734 0.4269 0.103 Table 2. Atomic coordinates and displacement parameters (in Å). Atom Site x y z Uiso

Crystal structure of dichlorobis(2-pyridinealdoxime-N,N′)-manganese(II) dihydrate, MnCl 2 (C 6 H 6 N 2 O) 2 · 2H 2 O