Bis{cis‐[MoO2]} Complexes of 4, 6‐Diacetyl Resorcinol Bis(hydrazone)and Their Catalytic Application for the Three Components Dynamic Covalent Assembly via Hantzsch Reaction. Issue 23 (16th August 2017)

• Record Type: Journal Article
• Authors: Maurya, Mannar R.; Rana, Lata; Jangra, Nancy; Avecilla, Fernando
• Is Part Of: ChemistrySelect. Volume 2:Issue 23(2017)
• Page Start: 6767
• Page End: 6777
• Publication Date: 2017-08-16
• Subjects: Binuclear dioxidomolybdenum complexes -- Bis(dibasic tridentate) ligands -- Crystal structures -- Spectroscopy studies -- Hantzsch reaction; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201701629
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Four binuclear dioxidomolybdenum(VI) complexes with Schiff base ligands, H4 dar(bhz)2 (I ), H4 dar(inh)2 (II ), H4 dar(nah)2 (III ) and H4 dar(fah)2 (IV ) (H2 dar=4, 6‐diacetyl resorcinol and Hbhz=benzoylhydrazide, Hinh=isonicotinoylhydrazide, Hnah=nicotinoylhydrazide, and Hfah=2‐furoylhydrazide) have been prepared by the reaction of ligand with [Mo VI O2 (acac)2 ] (Hacac=acetylacetone) in 1:2 ratio in methanol. Isolated complexes[(Mo VI O2 )2 {dar(bhz)2 }(H2 O)2 ] (1 ), [(Mo VI O2 )2 {dar(inh)2 }(H2 O)2 ] (2 ), [(Mo VI O2 )2 {dar(nah)2 }(H2 O)2 ] (3 ) and [(Mo VI O2 )2 {dar(fah)2 }(H2 O)2 ] (4 ) are characterized by elemental (CHN) analysis, spectral (FT‐IR, UV‐vis, 1 H and 13 C NMR) and thermogravimetric analysis. Single crystal X‐ray diffraction analysis of complexes1, 2 and4 confirms their binuclear structure and distorted octahedral geometry around each molybdenum where ligands behave as bis(dibasic tridentate) coordinating through phenolic oxygen, azomethine nitrogen and enolic oxygen atoms of each unit. These complexes have successfully been used as catalyst precursors in solvent as well as solvent free conditions for the one‐pot three components (ethylacetoacetate, benzaldehyde and ammonium acetate) dynamic covalent assembly, via Hantzsch reaction using hydrogen peroxide as an oxidant. Abstract : Synthesis and characterisation of binuclear dioxidomolybdenum (VI) complexes of the type [(Mo VI O2 )2 {bis(ONO)}(H2 O)2 ] have been reported. These complexes are efficient catalysts for the one‐pot three components (ethylacetoacetate, benzaldehyde and ammonium acetate) dynamic covalent assembly, via Hantzsch reaction using hydrogen peroxide as an oxidant in solvent as well as solvent free conditions.