Source of materialThen itronyln itroxide radical 4,4,5,5-tetramethyl-2-(1-methyl-1H-benzimidazol-2-yl)-4,5-dihydroimidazole-1-oxyl-3-oxide (NIT-MeImz) was prepared according to the literature method [1,2]. The [Hg 2 (NIT-MeImz) 2 (SCN) 4 ]complex was synthesized by adding KSCN (0.125 g, 1mmol) to 20 mL of an ethanolsolution containing HgCl 2 (0.272 g, 1m mol) and 1mmol). The mixture was stirred for 4hatroom temperature andthenf ilteredoff.The black filtrate was allowed to stand at room temperature. Black crystals suitable for X-ray analysis were obtained after two weeks. Elemental analysis-found:C,34.25 %; H, 3.20 %; N, 13.74 %; calculated forC 34 H 38 Hg 2 N 12 O 4 S 4 :C ,3 3.80 %; H, 3.17 %; N, 13.91 %. DiscussionDuring the past two decades, the field of molecular magnets has triggered fast-growing interest in organic free radicals as building blocks in the engineering of molecular based magnets [3]. In many different types of organic radicals, research has focused on then itronyln itroxide radicals( NITR)f amilyb ecause of their flexibilitya nd functionality [ 4].T hese radicals aree specially attractive duetotheir donoratoms andtoassemblinganextended coordination with changing magnetic coupling. There have been many studies on the magnetic properties of the nitronyl nitroxide and imino nitroxide radicals of metal complexes [5][6][7]. However, thereports of thediamagnetic metal ions with radicals are much less than those of the paramagnetic metal ions with radicals. In thepresent work,wehaveobtainedanovel thiocyanic-bridged dimercury (

The reaction of silver 4,4′-biphenyldicarboxylate with 1,3-diaminopropane (DAP) and 2-amino-5-methylpyridine (AMP) respectively results in the formation of two dinuclear silver(I) complexes:The complexes are characterized by elemental analysis and X-ray crystallography. Complex 1 crystallizes in the triclinic system, P-1 space group, a = 8.585 (2) Å, b = 8.849(2) Å, c = 9.890(3) Å, α = 107.893(3)°, β = 94.139(3)°, γ = 113.202(3)°, V = 640.9(3) Å 3 , Z = 1. Complex 2 crystallizes in the triclinic system, P-1 space group, a = 11.818(3) Å, b = 13.132(4) Å, c = 13.281(4) Å, α = 92.571(4)°, β = 96.425(3)°, γ = 102.142(4)°, V = 1997.5(10) Å 3 , Z = 2. Complex 1 consists of a macrocyclic dinuclear silver(I) dication, a 4,4′-biphenyldicarboxylate anion, and two water molecules of crystallization. Each Ag atom is in a linear coordination. Complex 2 consists of a dinuclear silver(I) complex molecule and two water molecules of crystallization. Each Ag atom is in a T-shaped coordination. The Ag⋯Ag separations are 5.127(2) Å in 1 and 3.172(2) Å in 2.

C 52 H 64 N 18 O 8 Zn, monoclinic, P2 1 /n (no. 14), a =17.825(2) Å, b =7.3268(7) Å, c =21.182(2) Å, b =92.902(1)°, V =2762.8 Å 3 , Z =2,R gt (F) =0.037, wR ref (F 2 ) =0.093, T =294 K. Source of materialThenitronylnitroxide radical 2-(4-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (NITpPy)w as prepared according to [1].The Zn(NITpPy) 2 (N(CN) 2 ) 2 ) × 2NITpPy was synthesized by adding Na[N(CN) 2 ](0.045 g, 0.5 mmol) to 20 mL of an ethanol solution containing Zn(OAc) 2 × 6H 2 O(0.0112 g, 0.5m mol) and NITpPy (0.248 g, 1mmol). The mixture was stirred for 5hat room temperature and then filtered off. Thed ark filtrate was allowedtostand at room temperature. Darkcrystals suitable for X-ray analysis were obtained after three weeks. Elemental analysis-found:C,55.10 %; H, 5.72 %; N, 22.32 %; calculated for C 52 H 64 N 18 O 8 Zn: C, 55.04 %; H, 5.69 %; N, 22.22 %. IR data areavailable in the CIF file. DiscussionAlarge number of multidimensional complexes linked by means of different bridging ligand systemssuch as azido, 4,4'-bipyridine andoxalate have markedly increased in the past fewyears [2,3]. It has also been documented that dicyanamide can be regarded as an idealligandtoconstructpolymers, due to the rich structural and topological features along with the magnetic properties related to this ligand. On the other hand, the nitronylnitroxide radicals acting as useful paramagnetic building blocks have been extensively used to assemble molecular magnetic materials [4][5][6][7]. Taking advantage of theabilitiesofbothnitroxide radicals andthe above mentioned kind of anions to coordinate transition metals, we are dealing with the use of the dicyanamide anions as bridging ligands. In the title crystal structure, the anion [N(CN) 2 ]-acts as end-toend bridging ligand giving rise to achain structure. The Zn atom is bonded to two apical NITpPy units and four equatorial N(CN) 2 units which bridge adjacent metal sites. The distorted octahedral metal site is located on an inversion center, therefore, both radicals anddicyanamide anions areintrans positions. The crystal structure consists of infinite chains of Zn(NITpPy

C 30H38Cd2N10O2S4,m onoclinic, P121/c1(no. 14), a =7.4031(3) Å, b =26.526(1) Å, c =10.0970(4) Å, b =108.111(2)°, V =1884.6 Å 3 , Z =2,R gt (F) =0.024, Source of materialAmethanol solution of Cd(OAc)2 · 2H 2 O(0.26 g, 1mmol) was added to amethanol solution (30 ml) of ammonium thiocyanate (0.15 g, 2mmol) and the Schiff base ligand (2-morpholin-4-ylethyl)-(1-pyridin-2-ylethylidene)amine (0.23 g, 1m mol) with stirring. The resulting solution was allowed to stand at room temperature for aweek, yielding colorless block-shaped single crystals. Experimental detailsHatoms were constrained to ideal geometries, with d(C-H) = 0.93 -0.97 Å,and U iso(H) =1.2 Ueq(C) or 1.5 Ueq(C7). DiscussionConsiderable attention has been focused on Schiff bases and their complexes because of the interesting structures and applications [1][2][3]. The cadmium(II) complexes are widely investigated for their fluorescent properties [4][5][6]. The title crystal structure is built up of acentrosymmetric dimeric cadmium(II) complex. The Cd···Cd distance is 5.936(2) Å.The Cd(II) atom is coordinated by three Na toms of the tridentate ligand 2-morpholin-4-ylethyl)-(1-pyridin-2-ylethylidene)amine, two Nand one Satoms from three thiocyante ligands, forming a distorted octahedron. The two halves of the dimer are related by a center of inversion. The distortion of the octahedral coordination can be observed on the bond angles: ∠N1-Cd1-N2 =68.43(7)°a nd ∠N2-Cd1-N3 =74.55°are much smaller than 90°,which is caused by the strain created by the five-membered chelate rings N1-Cd1-N2-C6-C1 and N2-Cd1-N3-C9-C8, respectively. The bond lengths d(Cd-N) are in the range of 2.99(2) -2.438(2) Å and d(Cd-S) =2.6712(6) Å,which is comparable to the similar cadmium(II) complexes with Schiff bases [7][8][9].

No abstract