De-Gang Ding

Syntheses, crystal structures, and properties of 2-(1H-tetrazol-1-yl) acetic acid complexes

Three new complexes have been prepared based on 2-(1H-tetrazol-1-yl) acetic acid (Htza) and the Ln(III) salts La(NO)3 · 6H2O, PrCl3 · 6H2O, and NdCl3 · 6H2O. Their crystal structures have been characterized by single crystal X-ray crystallography. In each instance, the tetrazole ligand is both bridging and chelating-bridging connecting Ln(III) ions via the oxygens from carboxylate moieties. Thus infinite 1-D coordination polymers are formed. In addition, solid state UV spectra of the complexes are investigated.

Two New Nickel(II) Complexes of (4-Amino-1,2,4-triazole-3,5-diyldithio)diacetic Acid: Syntheses, Crystal Structures and Characterizations

Two new complexes [Ni(phen)(H 2 O) 4 ] · (atda)(H 2 O) 5 (1) and [Ni 2 (4,4′ -bipy) 2 (H 2 O) 8 ] · (atda) 2 (2) (where H 2 atda = (4-amino-1,2,4-triazole-3,5-diyldithio)diacetic acid, phen = 1,10-phenanthroline, 4,4′ -bipy = 4,4′ -bipyridine) have been synthesized and characterized by elemental analysis, IR, UV, thermogravimetric analysis and X-ray diffraction technique. X-ray structural analyses reveal that the two complexes are both three-dimensional (3D) supramolecular structures and possess similar structural characters. The Ni(II) centers are both in distorted octahedral coordination environments, six-coordinated by four water molecules and two nitrogen atoms from a 1,10-phenanthroline molecule or two 4,4′ -bipyridine molecules. The atda 2 − ligands do not coordinate to the Ni(II) centers, but only exist as counter anions, forming hydrogen bonds with coordinated or uncoordinated water molecules. Various hydrogen-bonding interactions play an important role in the assembly of three-dimensional supramolecular architectures.

Syntheses, crystal structures, and catalytic activities of three new Cu(II) coordination polymers based on 2-(1H-1,2,4-triazole)-1-acetic acid

Three new coordination polymers, {[Cu(trza)(2,2′-bipy)(H2O)] · (ClO4)} n (1), {[Cu(trza)(2,2′-bipy)(H2O)] · (BF4)} n (2), and {[Cu(trza)(4,4′-bipy)] · (H2O) · (ClO4)} n (3) (Htrza = 2-(1H-1,2,4-triazole)-1-acetic acid), have been synthesized and characterized by single-crystal X-ray diffraction analysis. Both 1 and 2 exhibit 1-D chain structure while 3 displays 2-D layer structure. The catalytic activities of 1 and 3 in the green oxidative coupling of 2,6-dimethylphenol have been investigated.

Syntheses, crystal structures, and fluorescence of two complexes constructed by N ′-(pyridin-2-ylmethylene)-2-( 1H -1,2,4-triazol-1-yl)acetohydrazide

Two new binuclear complexes, Cd2(HL)2(NO3)4 · (CH3OH)2 (1) and Cu2(L)2(ClO4)2 (2), based on N′-(pyridin-2-ylmethylene)-2-(1H-1,2,4-triazol-1-yl)acetohydrazide (HL) and Cd(II) and Cu(II) salts have been synthesized and characterized by single crystal X-ray diffraction. Hydrogen bonds and π–π interactions extend both binuclear molecules, a 3-D supramolecular framework for 1 and 1-D staggered chains for 2. Fluorescence of both complexes is discussed.