设计合成了一系列以吡啶二亚胺、吡啶胺-亚胺和吡啶二胺为螯合配体的三价钒配合物2a ～ 2e,并通过红外和元素分析等技术手段对其进行了结构表征.在助催化剂和再生活化剂的存在下,这些催化剂展示出了高活性和良好的高温稳定性.得到高相对分子质量、单峰分布聚乙烯表明聚合体系为单活性中心.以吡啶二胺为螯合配体的配合物2e(2,6-bis[2,6-(iPr)2PhNC(Me)]2(C5H3N)VCl)在50℃下显示出的活性高达6.96 kg PE/mmolV·h,且在70℃时仍保持高的催化活性,这表明双阴离子吡啶二胺能更好的保护催化活性中心.此外,这类三价钒催化剂能高活性催化乙烯-降冰片烯及乙烯-己烯共聚,在温和条件下即可得到较高单体插入率(降冰片烯37.3％,己烯4.8％)的共聚物.
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