A kind of mononuclear vanadium complex and its preparation method and application

Abstract

The present invention provides a mononuclear vanadium complex shown as formula I, and also provides a preparation method and application of the complex. The mononuclear vanadium complex has the advantages of simple preparation method, low toxicity, high catalytic activity and narrow molecular weight distribution; and the method can effectively control the molecular weight of the polymer according to the needs, and has a broad market prospect.

Description

technical field [0001] The invention relates to a mononuclear vanadium complex and its application. Background technique [0002] In recent years, the market demand for biodegradable polymers such as polylactic acid, polyglycolic acid, and lactic acid amino acid copolymers has grown dramatically due to their biological safety. Especially polylactic acid, it has received people's great attention (Chemical Routes for the Transformation of Biomass into Chemicals, Chem.Rev.2007,107,2411; Polymers from renewable resources: A perspective for a special issue of polymer reviews, Polym.Rev ., 2008, 48, 1; Synthetic polymer scaffolds for tissue engineering, Chem. Soc. Rev., 2009, 38, 1139). [0003] Industrially, these biodegradable polymers can be prepared by ring-opening polymerization of corresponding monomers, which requires the use of catalysts. Currently, stannous isooctanoate (Sn(Oct) 2 ) is a catalyst commonly used in industry at present. [0004] However, studies in recen...

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Problems solved by technology

However, these vanadium complexes, especially when the ligand includes three or four phenolic structures, have very limited applications in ring-opening polymerization (Thermodynamics, Kinetics, and Mechanisms of Cyclic Esters Polymerization, ACS Symposium Series, Vol.764, Chapter 13, pp 160–198; A journey into the electrochemistry of vanadium compounds, Coord.Chem.Rev., in press, doi:10.1016 / j.ccr.2015.02.022)

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