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C13H17N5OS2Zn, triclinic, P1 (no. 2), a = 8.143(1) Å, b = 9.179(1) Å, c = 12.677(1) Å, + = 74.256(1)°, * = 75.117(2)°, & = 71.838(1)°, V = 851.0 Å, Z = 2, Rgt(F) = 0.031, wRref(F) = 0.077, T = 298 K. Source of material 1-Pyridin-2-yl-ethanone (2 mmol, 242 mg), NH4SCN (2 mmol, 152 mg), Zn(CH3COO)2 (2 mmol, 498 mg) and 2-(2-aminoethylamino)ethanol (2 mmol, 214 mg) were dissolved in methanol (100 ml), yielding a clear yellow solution after stirring in air at room temperature for 3 h. Then yellow block-shaped crystals of the title compound were obtained by slowly evaporating of the solvent for about two weeks at room temperature. The crystals were filtered off, washed with small amounts of methanol, and finally dried in vacuum (yield 65.8 %). Discussion Schiff bases can coordinate many metal ions to form mononuclear or multinuclear complexes because of strong coordination ability and versatile coordination mode of the –C=N– group [13]. However, only limited Schiff bases of ketone and their complexes have been reported up to now [4-7]. The title crystal structure is built up by only the Schiff base complexes. Each molecular unit contains of one Zn(II) cation, one tridentate Schiff base ligand and two SCN anions. The Zn atom is penta-coordinated by N1, N2, N3 atoms from tridentate Schiff base ligand and N4, N5 atoms from two SCN anions, leading to a distorted square pyramidal coordination. The bond lengths of Zn—N are from 1.975(2) Å to 2.204(2) Å, while bond angles around the Zn atom vary from 74.46(9)° to 154.58(9)°, consistent with the corresponding values in the reported analoges Zn(C17H15N2O)2 and Zn2(C15H14N2O5)2(C6H5N)4 [8,9]. There are three ring systems in the molecular structure, one pyridine ring (N3/C7-C11, A) and two five-membered chelate rings (Zn1/N2/N3/C6/C7, B and Zn1/N1/N2/C3/C4, C), which are nearly coplanar with the dihedral angles of 5.13(2)° (A and B), 15.79(1)° (A and C) and 10.67(1)° (B and C), respectively. Two Schiff base ligands arrange in an anti-parallelled fashion due to the aromatic -···stacking interactions, which link two molecules into a dimer. Two rings A (x,x,z and –x+2,–y+1,–z) of two neighboured molecules stack with center-to-center distance of 3.681(2) Å, dihedral angle of 0.00° and the interplanar spacing are 3.377(5) Å, respectively. The ring centroid distances lie in the normal range of 3.3 3.8 Å, indicative of -···stacking interactions [10]. The dimers are linked into a chain by the intermolecular hydrogen bonds N1–H1···O1 (–x+1,–y,–z+1) and the chains are further linked into a two-dimentional network by the intermolecular hydrogen bonds O1–H1A···S1 (x–1,y,z). Z. Kristallogr. NCS 225 (2010) 679-680 / DOI 10.1524/ncrs.2010.0297 679 © by Oldenbourg Wissenschaftsverlag, München Crystal: yellow block, size 0.10 × 0.17 × 0.26 mm Wavelength: Mo K+ radiation (0.71073 Å) .: 16.95 cm−1 Diffractometer, scan mode: Bruker SMART CCD, #/% 2,max: 50.02° N(hkl)measured, N(hkl)unique: 4438, 2940 Criterion for Iobs, N(hkl)gt: Iobs > 2 )(Iobs), 2352 N(param)refined: 199 Programs: SHELXS-97, SHELXL-97 [11] Table 1. Data collection and handling. H(1) 2i 0.4807 0.1507 0.4158 0.047 H(1A) 2i 0.3126 −0.1201 0.4632 0.089 H(1B) 2i 0.3518 −0.0748 0.2858 0.059 H(1C) 2i 0.5420 −0.0632 0.2804 0.059 H(2A) 2i 0.3433 0.1826 0.2332 0.055 H(2B) 2i 0.2376 0.1571 0.3560 0.055 H(3A) 2i 0.2895 0.3836 0.4002 0.060 H(3B) 2i 0.3601 0.4217 0.2710 0.060 H(4A) 2i 0.4843 0.5527 0.3472 0.062 H(4B) 2i 0.5432 0.4025 0.4384 0.062 H(5A) 2i 0.7108 0.6265 0.3508 0.106 H(5B) 2i 0.8077 0.6913 0.2315 0.106 H(5C) 2i 0.9169 0.5829 0.3222 0.106 H(8) 2i 1.1024 0.5599 0.1346 0.067 H(9) 2i 1.3249 0.4443 0.0032 0.075 H(10) 2i 1.3223 0.2082 −0.0287 0.073 H(11) 2i 1.0947 0.0975 0.0686 0.064 Table 2. Atomic coordinates and displacement parameters (in Å). Atom Site x y z Uiso

Crystal structure of diisothiocyanato-{2-[2-(1-pyridin-2-yl-ethylidene-amino) ethylamino]ethanol}zinc(II), Zn(NCS) 2 (C 11 H 17 N 3 O)