A macrocyclic silver polycarbene complex based on 1, 2, 4-triazole units: synthesis and postsynthetic modification. Issue 12 (28th February 2018)

• Record Type: Journal Article
• Authors: Zhang, Le; Han, Ying-Feng
• Is Part Of: Dalton transactions. Volume 47:Issue 12(2018)
• Page Start: 4267
• Page End: 4272
• Publication Date: 2018-02-28
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt00169c
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A method for the synthesis of a new rectangular 1, 2, 4-triazole-containing macrocycle via photochemical [2 + 2] cycloaddition with a metal–carbene template was developed. Abstract : Facile synthesis and postsynthetic modification of a rectangular 1, 2, 4-triazole-based NHC macrocycle have been developed. The silver complex [Ag2 (1 )2 ](BF4 )2 is derived from the corresponding triazole salt H2 -1 (BF4 )2 upon reaction with Ag2 O. The structure of the metallocyclic Ag–NHC complex [Ag2 (1 )2 ](BF4 )2 was determined by single-crystal X-ray diffraction analysis. The metal–carbene template undergoes photodimerisation of its terminal cinnamic esters (UV irradiation, λ = 365 nm) and generates a macrocyclic tetra (NHC) ligand. The desired tetra-1, 2, 4-triazole macrocycle was isolated in good yield by eliminating the metal ions from the photodimerisation product. All complexes were fully characterized by multinuclear NMR measurements ( 1 H, 13 C{ 1 H}, COSY, HSQC and HMBC) and ESI mass spectroscopy.