Coordination Networks Self-assembled by Transition Metal Salts With 4,4′-oxydianiline (4,4′-oda). Syntheses and Structures of ∞ 1 [Ni(NCS) 2 (4,4′-oda) 2 ], ∞ 2 [Co(NCS) 2 (4,4′-oda) 2 ] and ∞ 2 [M(N 3 )(4,4′-oda) 2 ]NO 3 (M=Cd II or Co II )

Abstract

Four infinite complexes 1 1 [Ni(NCS) 2 (4,4 0 -oda) 2 ], 1 2 [Co(NCS) 2 (4,4 0 -oda) 2 ] and 1 2 [M(N 3 )(4,4 0 -oda) 2 ]NO 3 ½M 5 Cd II ð3Þ or Co II (4)] were obtained by reactions 4,4 0 -oxydianiline (4,4 0 -oda) with Ni(SCN) 2 , Co(SCN) 2 , Cd(N 3 ) 2 and Co(N 3 ) 2 , respectively which have been structurally established by single-crystal X-ray diffraction. Complex 1 contains one-dimensional doublestranded chains comprising 24-membered Ni 2 (4,4 0 -oda) 2 macrocycles, each formed by two 4,4 0 -oda ligands and two octahedral Ni II centers. Complex 2 exhibits twodimensional non-interpenetrating networks consisting of large 48-membered macrocycles each formed by four 4,4 0 -oda ligands and four octahedral Co II centers. The crystal structures of 3 and 4 are isomorphous and both contain one-dimensional double-stranded chains comprising 24-membered M 2 (4,4 0 -oda) 2 macrocycles, which are interlinked by m-1,3-azide groups to generate cationic two-dimensional sheets. These sheets are further connected by hydrogen bonds between the amine groups and nitrate ions to furnish three-dimensional networks. Crystal data: complex 1 crystallizes in the monoclinic space group P2 1 /c with a 5 11.990(4) Å , b 5 9.413(4) Å , c 5 12.827(4) Å , b 5 116.32(2)8, V 5 1297.6(8) Å 3 and Z 5 2; complex 2 crystallizes in the orthorhombic space group Pbca with a 5 9.583(2) Å , b 5 12.738(3) Å , c 5 21.039(4) Å , V 5 2568.2(9) Å 3 and Z 5 4; complex 3 crystallizes in the monoclinic space group C2/c with a 5 23.036(5) Å , b 5 5.920(1) Å , c 5 17.800(4) Å , b 5 92.67(3)8, V 5 2424.8(9) Å 3 and Z 5 4; complex 4 crystallizes in the monoclinic space group C2/c with a 5 22.861(5) Å , b 5 5.812(1) Å , c 5 17.720(4) Å , b 5 93.00(3)8, V 5 2351.2(8) Å 3 and Z 5 4.

1D and 2D End-to-End Azide-Bridged Cobalt(II) Complexes: Syntheses, Crystal Structures, and Magnetic Properties

“…The anisotropic Co(II) is an attractive alternative to the isotropic Mn(II) to obtain azido-bridged 1D−3D compounds with higher T c or different magnetic properties, taking into account that theoretically the great diversity of dimensionalities and topologies found in the [Mn(N 3 ) 2 (L) 2 ] n compounds may be obtained for the same [Co(N 3 ) 2 (L) 2 ] n derivatives. But, as far as we know, surprisingly only a few high-dimensional azido-bridged Co(II) compounds have been described to the date − and in some cases the magnetic behavior has not been described. ,, In this paper, we report the syntheses and magnetic properties of two new Co(II) end-to-end azido-bridged low-dimensional compounds: the 1D compound catena -[Co(μ 1,3 -N 3 )(N 3 )(py) 2 (H 2 O)] n ( 1 ) and the square-layers 2D compound [Co(μ 1,3 -N 3 ) 2 (4-acpy) 2 ] n ( 2 ) (py = pyridine, 4-acpy = 4-acetylpyridine). From the point of view of the magnetic properties, 1 and 2 are antiferromagnetically coupled systems, but for 2 magnetic ordering and spontaneous magnetizations is achieved below T c = 25 K.…”