Source of material 2-{2'-[(l'-methyl)benzimidazolyl]}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (NIT-MeBzIm) was prepared accordingtothe literature procedure [1]. The mixture of 5mLmeth-anol solution of NIT-MeBzIm (0.4 mmol) and 5m Lm ethanol solution of MnCl2.·.6H2O(0.2 mmol) was stirred for three hours at room temperature, and then filtered. The clear brown-black filtrate was diffused with diethyl ether vapour at room temperature. Dark brown crystals were formed and collected by filtration and dried in air. DiscussionThe synthesis and study of transition metal complexes incorporationg organic free radicals is amajor research aim in the field of molecular magnetism. Nitronyl nitroxide radicals (NITR), stable organic radicals, have played aprominent role in the design and construction of molecular magnetic materials [2,3]. Up to now, there have been alarge number of investigations with regard to the crystal structures of transition metal complexes with NITR [4][5][6][7]. Therefore, design and syntheses of metalradical compounds may lead to ab etter understanding of magneto-structural correlations. In the title crystal structure, two NIT-MeBzIm radical ligands act as bidentate chelating ligands coordinating manganese(II) ion through the oxygen atoms of and the nitrogen atoms of the benzimidazolyl rings. The coordination of Mn(II) ion is an distorted octahedral. The equatiorial plane is formed by N1, N6 and O1 from NIT-MeBzIm and Cl2 anion. The Mn-Nbond lengths in the basal plane are 2.236 (3)

Source of materialThe nitroxide 2-{2'-[(1'-methyl)benzimidazolyl]}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (NIT-1'-MeBzIm) was prepared by the literature method [1]. The methanol solution of NIT-1'-MeBzIm (10 ml, 0.4 mmol) was added dropwise to the methanol solution of Mn(ClO 4 ) 2 · 6H 2 O(15 ml, 0.2 mmol), the mixture was stirred further two hours affording ac olor change from dark purple to dark cyan, then the reaction mixture was filtered. The filtrate was kept in an atmosphere of ether vapor at room temperature. Slow diffusion of ether into the methanol solution of the complex produced cyan single crystals. DiscussionThe design and synthesis of molecule-based magnetic materials are one of the major subjects of materials science. In many different types of organic radicals, research has focused on the nitronyl nitroxide radicals (NITR) family because of their flexibility and functionality [2,3]. Several investigations on the magnetic prop- 2+ are connected to a2 D layer by the intermolecular hydrogen bonds.

C 48H64CuN18O8,t riclinic, P1 (no. 2), a =7.133(1) Å, b =13.718(2) Å, c =14.136(2) Å, a =88.425(2)°, b =78.528(2)°, g =87.390(2)°, V =1354.0 Å 3 , Z =1, R gt (F) O(0.200 g, 1mmol) and NITpPy (0.468 g, 2 .mmol). The mixture was stirred for 4hand then filtered. The black filtrate was allowed to stand at room temperature. Black crystals suitable for X-ray analysis were obtained after one week. DiscussionThe design and synthesis of transition metal complexes with organic free radicals is one of the major challenges in the field of molecular magnetic materials [2,3]. Nitronyl nitroxide radicals (NITR), stable organic radicals, have been widely employed as molecular units in the design and synthesis of molecular magnetic materials [4,5]. However, because NITRs are poor electrondonor ligands, their coordination ability is limited. Meanwhile, the azide anion is av ersatile ligand that can link to transitionmetal atoms with different coordination modes. Therefore, to proove advantage of the abilities of both nitronyl nitroxide radicals and the azide anions to coordinate transition metals, we synthesized the metal-radical complex [Cu(NITpPy) 4(N3)2].In the title crystal structure, the metal ion lies on an inversion center and adopts adistorted octahedral environment. It is bonded to four nitrogen atoms of the pyridyl groups in addition to two azido ligands. The two Natoms of the azide groups and the two Natoms of the radical ligands occupy the equatorial positions. The Cu-N bond lengths are 1.993 (2)

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