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The title compound {[Co2(NIT4Py)4(fum)2(H2O)4] · (H2O)2}n, where NIT4Py = 2-(4'-pyridinyl)-4,4,5,5-tetra-methylimidazoline-1-oxyl-3-oxide and fum = fumarate, was prepared and structurally characterized by X-ray diffraction. It crystallizes in triclinic, space group P1 with a = 9.8853(9) Å, b = 13.2167(13) Å, c = 13.8481(12) Å, α = 68.5400(10)°, β = 73.467(2)°, γ = 74.596(2)°, V = 1587.6(3) Å3, Z = 1, and R1 [I > 2σ(I)] = 0.0662. The complex consists of two kinds of neutral infinite 1-D chains, in which [Co(NIT4Py)2(H2O)2] moieties are connected by fumarate anions in a bis-monodentate mode. These 1-D chains are further connected by hydrogen bonds, generating a 2-D network. The variable temperature magnetic susceptibility measurement reveals that the magnetic couplings between Co(II) and NIT4Py are weak antiferromagnetic interactions. [ABSTRACT FROM AUTHOR]

[Hg2(L1)2I4] (1), [Cd2(L1)2I4] (2), {[Cd(L1)2(SO4)(H2O)]·4H2O}n(3), {[Zn2(L2)2(Cl)4]·0.5H2O} (4), {[Cu2(L2)2(SO4)2(H2O)4]·2.5H2O} (5), and {[Cd(L2)2(SO4)(H2O)]·3H2O}n(6), based on N–(3–picolyl)–N′–(3–pyridyl)urea (L1) or N–(4–picolyl)–N′–(3–pyridyl)urea (L2), have been synthesized and characterized by elemental analyses, IR spectra, single-crystal and powder X-ray diffraction, and thermogravimetric analyses. Complexes1and2are isomorphous and feature similar rectangular metal organic loops, which were further extended into 2-D supramolecular structures through hydrogen bonds. Complex3possesses a 2-Dsqlsheet, and the channels between the neighboring sheets are filled with lattice water molecules, which formed a 1-D water tape. Complex4also exhibits a rectangular metal organic loop and a 3-D supramolecular structure with the help of hydrogen bonding interactions. Complex5also possesses a metal organic loop, and the water molecules interacted with sulfates, constructing a 1-D water–sulfate tube. Complex6features a 1-D loop polymeric chain. Moreover, the solid state luminescences of1–4and6have been investigated. [ABSTRACT FROM AUTHOR]

Two binuclear complexes [Cu2(IA)4(DMSO)2]·CH3OH (1), [Cd2(IA)2(phen)2I2] (2), and one 1-D {[Pb2(IA)4]·CH3OH}n(3) (IAH = indole-3-acetic acid, phen = 1,10-phenanthroline) have been prepared and characterized by single crystal X-ray diffraction. Both1and2are binuclear wherein the central Cu ions are bridged by IA in1, while Cd ions are bridged by I−in2. Complex3has a 1-D chain structure based on secondary building units (SBUs) of [Pb2(IA)4]. The three complexes show strong fluorescence emissions, and chemosensor behaviors for metal cations are investigated in mixed DMF/H2O (1 : 9 v/v) solvent. The results reveal that2shows effective sensing to Pb2+. The mechanism of the detection to Pb2+can be attributed to cation-exchange reaction between cadmium and lead ions. Binuclear complexes [Cu2(IA)4(DMSO)2]·CH3OH (1), [Cd2(IA)2(phen)2I2] (2) and 1-D {[Pb2(IA)4]·CH3OH}n(3) (IAH = indole-3-acetic acid, phen = 1,10-phenanthroline) have been prepared and characterized by single crystal X-ray diffraction. The three complexes show strong fluorescence emissions in mixed DMF/H2O solvent.2showed highly sensitive and selective sensing function to Pb2+ion. [ABSTRACT FROM PUBLISHER]