Synthesis and structural characterization of N‐methylanthraniloyl‐ (4‐ethylthiosemicarbazide) and its Cu(II) trinuclear complex. Issue 3 (20th June 2021)

• Record Type: Journal Article
• Authors: Thuy, Pham Thu; Dinh, Le Canh; Huy, Nguyen Gia; Oanh, Pham Thi Ngoc; Thang, Pham Chien
• Is Part Of: Vietnam journal of chemistry. Volume 59:Issue 3(2021)
• Page Start: 290
• Page End: 295
• Publication Date: 2021-06-20
• Subjects: Acyl thiosemicarbazides -- trinuclear complexes -- Cu(II) complexes; Chemistry -- Periodicals; 540
• DOI: 10.1002/vjch.202000129
• Languages: English
• ISSNs: 0866-7144

Abstract

Abstract: The new ligand N ‐methylanthraniloyl(4‐ethylthiosemicarbazide) H2 L was synthesized by the treatment of anthranilic acid hydrazide and ethyl isothiocyanate in absolute ethanol. The composition and structure of H2 L were characterized by spectroscopic methods such as ESI MS, IR, 1 H and 13 C{ 1 H} NMR spectroscopy as well as SCXRD. Reaction of H2 L and mixture of [Cu(MeCN)4 ](PF6 ) and o ‐phenanthroline in methanol gave rise to a cationic Cu(II) trinuclear complex, which could be separated as PF6 – salt with the composition of [Cu3 (L)2 ( o ‐phen)2 ](PF6 )2 . The spectroscopic and X‐ray crystallographic data analyses demonstrated that H2 L deprotonates hydrazide protons and the resulting dianion {L 2– } acts as bridging ligand of which most potential donor atoms form stable chelates with Cu(II) ions. In particular, the central Cu(II) ion coordinates with two dianions {L 2– } via ( O, N 2 ) donor sets, thereby adopting a distorted square planar coordination mode with trans configuration. While each of two terminal Cu(II) ions is five‐coordinate with the coordination sphere composed of ( S, N 1, N amine ) and ( N, N ) donor sets belonging {L 2– } and o ‐phenanthroline, respectively.