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In the title compound, C6H7N3O2·H2O, all atoms of 2-ureidopyridine N-oxide molecule are approximately coplanar and adjacent molecules are connected by strong hydrogen bonds, resulting in a three-dimensional network. [ABSTRACT FROM AUTHOR]

The title complex, [Cu(C7H2N2O7)(C4H8N2O2)(H2O)], is a mononuclear copper(II) compound. The CuII ion is five-coordinated in a distorted pyramidal geometry by two N atoms from one dimethylglyoxime molecule, two O atoms from one 3,5-dinitro-2-oxidobenzoate ligand and one O atom from a water molecule. Strong hydrogen bonds connect adjacent molecules into a three-dimensional network. [ABSTRACT FROM AUTHOR]

Two new cyano-bridged one-dimensional heterobimetallic coordination polymers, [(bpca)2FeIII2(CN)6Cu(H2O)2·1.5H2O]n (2) and [(bpca)FeIII(CN)3Cu(bpca)(H2O)·H2O]n (3), and a trinuclear complex, [(bpca)2FeIII2(CN)6Mn(CH3OH)2(H2O)2]·2H2O (4), have been synthesized using the tailored tricyanometalate precursor (Bu4N)[Fe(bpca)(CN)3]·H2O (1) (Bu4N+ = tetrabutylammonium cation; bpca = bis(2-pyridylcarbonyl)amidate anion) as a building block and structurally characterized. In complex 2, the CuII ions are six-coordinated in an elongated distorted octahedral environment, and they are linked by distorted octahedrons of [Fe(bpca)(CN)3]- to form 1D chain of squares. Complex 3 is an unexpected chiral heterobimetallic helical chain complex, in which the helical chain consists of the asymmetric unit of [(bpca)Fe(CN)3Cu(bpca)(H2O)]. In complex 4, there are two independent trinuclear clusters in one asymmetric unit, and the coordination modes of the two methanol and two water molecules coordinating to the central Mn(II) ion are different (cis and trans). Complex 2 shows metamagnetic behavior with a Neel temperature of TN = 2.2 K and a critical field of 250 Oe at 1.8 K, where the cyanides mediate the intrachain ferromagnetic coupling between the CuII and FeIII ions. Complex 3 shows ferromagnetic coupling between CuII and FeIII ions, the best-fit for χMT versus T using a 1D alternating chain model leads to the parameters J1 = 7.9(3) cm-1, J2 = 1.03(2) cm-1, and g = 2.196(3). Complex 4 exhibits ferrimagnetic behavior caused by the noncompensation of the local interacting spins (SMn = 5/2 and SFe = 1/2) which interact antiferromagnetically through bridging cyano groups. [ABSTRACT FROM AUTHOR]

A neutral nickel complex with the extended tetrathiafulvalene-4,5-dithiolate ligand benzotetrathiafulvalenedithiolate (btdt2-) is synthesized and characterized. From the structural analysis, the neighboring molecules in this complex are stacked in a different way compared to the previously reported single-component metal [Ni(tmdt)2]. The computational studies confirm that the difference in molecular packing results in the variance of conductivity. [ABSTRACT FROM AUTHOR]

Two enantiopure one-dimensional complexes with helical structures, [Mn3((R,R)-Salcy)3(H2O)2Fe(CN)6·2H2O]n (1) and [Mn3((S,S)-Salcy)3- (H2O)2Fe(CN)6·2H2O]n (2) [Salcy = N,N′-(1,2-cyclohexanediylethylene)bis(salicylideneiminato) dianion], have been synthesized and characterized. Magnetic studies show that both complexes are ferrimagnets with the magnetic transition temperature at 3 K. [ABSTRACT FROM AUTHOR]