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A luminescent Zn(II)-based MOF, [Zn(dptz)(BDC)(H2O)]n [1, dptz = 3,6-di(1H-pyrazol-4-yl)-1,2,4,5-tetrazine, H2BDC = terephthalic acid], with Lewis basic nitrogen sites has been synthesized by a solvothermal method. Using ligands with higher pKa value, complex 1 exhibits excellent solvent and pH stabilities in the pH range 2–12. 1 can serve as a highly sensitive and efficient luminescent probe for detecting Fe3+ and Cr2O72− ions in aqueous systems. The values of KSV toward Fe3+ and Cr2O72− were estimated to be 1.61 × 103 M−1 and 1.26 × 104 M−1, respectively. The possible sensing mechanism has been discussed. All these results suggest 1 is a promising dual-functional luminescent sensor for the detection of Fe3+ and Cr2O72− ions in aqueous solution. [ABSTRACT FROM AUTHOR]

A new disulfoxide-La(III) complex {[La(L) 2 (DMF) 4 ](ClO 4 ) 3 } n (1) has been prepared by the reaction of La(ClO 4 ) 3   ·   n H 2 O and a flexible disulfoxide ligand, 1,6-bis(ethylsulfinyl)hexane (L), and characterized by elemental analysis, IR and single-crystal X-ray diffraction analysis (monoclinic system, space group C 2/ c , with a   =  24.94(2), b   =  12.012(8), c   =  20.81(1)  Å, β  =  117.57(1)°, V   =  5527(6)  Å 3 and Z   =  4). The crystal structure consists of polymeric chains of {[La(L) 2 (DMF) 4 ] 3+ } n cations and anions. In the cation of 1, each La(III) center is coordinated to eight O atoms from four distinct L ligands and four DMF molecules to give a square antiprism coordination geometry. The adjacent two La(III) ions are linked by two L ligands, which adopt bis-monodentate O-coordination bridging mode to form a double-bridging zigzag chain containing 22-membered macrocycles. [ABSTRACT FROM AUTHOR]

Two novel dimeric palladium(II) complexes with flexible pyridyl dithioether bridging ligands, [Pd(L 1 )Cl 2 ] 2 ( 1 ) and [Pd(L 2 )Cl 2 ] ( 2 ), where L 1 =1,3-bis(2-pyridylthio)propane and L 2 =1,3-bis(4-pyridylthio)propane, have been synthesized and structurally characterized by X-ray diffraction analyses. In both complexes, each Pd II center is four-coordinated in the trans -form by two chloride anions and two nitrogen donors from two distinct ligands. Complex 1 exhibits a unique 20-membered metallomacrocyclic structure with twisted conformation, while 2 shows a dinuclear 28-membered metallomacrocycle with planar conformation. In addition, there are weak C-H⃛Cl or C-H⃛S hydrogen bonding interactions in both complexes, resulting in different 3-D supramolecular architectures. [ABSTRACT FROM AUTHOR]