A Stable Trinuclear Zinc Cluster Assembled from a Thiazolylazo Dye and Zinc Acetate: Preparation, Structural Characterization and Spectroscopic Studies

Abstract

A thiazolylazo dye, 5-(diethylamino)-2-(2-thiazolylazo)phenol (HL), containing potential tridentate binding sites was synthesized in high yield and well characterized. In solution, the reaction of zinc acetate and the deprotonated ligand, L -, results in the instantaneous formation of the supramolecular trinuclear species [Zn 3 L 2 (OAc) 4 ] (1). UV/Vis and 1 H NMR spectroscopic titration experiments in solution confirmed that the ligand and zinc salt interact spontaneously with each other and produce exclusively the polymetallic complex with the metal-to-ligand ratio of 3:2. The crystal structures of both the ligand and coordination complex are reported in this paper. The aromatic part of HL is planar and, significantly, the

Dinucleating Amino-Phenolate Platform for Zinc Catalysts: Impact on Lactide Polymerization

“…The molecule contains two five-coordinated Zn (Zn1 and Zn2) centers with distorted trigonal bipyramidal geometries bridged to distorted octahedral Zn3 by two bidentate acetate groups. The paddle wheel is usually found as dinuclear Zn carboxylate clusters in metal organic frameworks, − and a few trinuclear species are involved in polymerization studies. , The Zn–O bond lengths are in the range of 1.954–2.119 Å, and the Zn–N length is between 2.137 and 2.191 Å, comparable to other known Zn­(II) acetate complexes. − Complex 5 is highly stable toward air and moisture.…”

Crystal structure of 3-[2-(1,3-thiazol-2-yl)diazen-1-yl]pyridine-2,6-diamine monohydrate

“…A search of the Cambridge Structural Database (Groom et al, 2016) for compounds with the (E)-2-(pyridin-3-yldiazenyl)thiazole moiety gave no hits. However, structures of substituted thiazolylazo derivatives were found, for example, 5-(diethylamino)-2-(2-thiazolylazo)phenol (QAVNAD; Zhang et al, 2005), 4-(2 0 -thiazolylazo)pyrocatechol (TZAZPC; Apinitis, 1978), 1-(2-thiazolylazo)-6-bromo-2naphthol (TAZBRN10; Kurahashi et al, 1976) and 1-(2-thiazolylazo)-2-naphthol (TAZNPL10; Kurahashi, 1976).…”

Metal-directed self-assembly of M3L2 (M=Zn, Cd) metal-organic architectures with a tripodal tris-bidentate chelator

“…Furthermore, 1 and 2 both feature a discrete triangular trinuclear motif (for 1, Zn3; for 2, Cd3), which are separated by two C3-symmetric L. It is distinguished from trinuclear zinc or cadmium units in the literature, which exist as metals bridged by carboxylate O or Cl, etc. and serve as inorganic nodes in coordination polymers [47][48][49][50]. Each metal ion in 1 and 2 is coordinated by one or two nitrates, which can be flirther substituted by other organic bridges such as 4,4'-bypridine.…”