二茂铁间苯甲酸锌配合物中心金属离子交换的研究

为了进一步研究有机-无机杂化晶体材料的中心金属离子的交换反应, 以间二茂铁基苯甲酸的钠盐作为配体, 与Zn(OAc)₂和辅助配体对二(三氮唑甲基)苯(btx)在常温下反应,得到一个新的双核配合物{[Zn(η₂-OOCH₄C₆Fc)(OOCH₄C₆Fc)(btx)]₂-(CH₃OH)(H₂O)₂} (1). 通过配合物1与Pb(Ⅱ)离子的中心金属离子交换反应, 得到了它的反应产品{[Zn_0.83- Pb_0.17(η₂-OOCH₄C₆Fc)(OOCH₄C₆Fc)(btx)]₂(H₂O)_1.5} (2), 并对其进行了X射线单晶衍射、原子吸收以及金属元素分析(ICP)和X射线能谱分析(EDS)的测定. 结果证明, 配合物1到2是通过单晶到单晶的转换产生的, 该结果为金属配合物在有效去除有毒金属离子的应用上提供了理论基础. 并显示了二聚二茂铁基羧酸锌配合物能被用来作为一个有效的阳离子交换材料去除铅离子, 同时为利用类似的金属羧酸配合物选择性地交换阳离子打下了基础.

The central metal ion exchange of a ferrocenyl carboxylate zinc complex

Ferrocenyl carboxylate zinc complex {[Zn(η²-OOCH₄C₆Fc)(OOCH₄C₆Fc)(btx)]₂(CH₃OH)(H₂O)₂} 1 (FcC₆H₄COONa = sodium m-ferrocenylbenzoic; btx = 1,4-bis(triazol-1-ylmethyl)benzene) has been synthesized and structurally characterized. In order to further investigate the central metal ion exchange reaction, we immersed the selectable single crystal of 1 into aqueous solutions of Pb- (NO₃)₂, and obtained a single-crystal to single-crystal (SCTSC) transformation product {[Zn_0.83Pb_0.17- (η²-OOCH₄C₆Fc)(OOCH₄C₆Fc)(btx)]₂(H₂O)_1.5} (2). 2 is characterized by EA, IR, XRD, ICP, EDS, atom absorption and X-ray single crystal determination. Our results show that the ferrocenyl carboxylate zinc complex can be used as an effective central metal ion exchange material for removing lead ion and set the stage for using analogous metal carboxylate for selective exchange of other cations.