Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.
Inorg Chem. 2009 Jul 20;48(14):6873-8. doi: 10.1021/ic9007922.
Seven compounds with framework structures made of divalent metal-imidazole (Im) complexes (M(II) = Co, Ni, and Mn) linked by 1,5-napthalenedisulfonate (1,5nds) were synthesized and structurally characterized. Five of these compounds, Mn(Im)(4)(1,5nds) (two forms), Co(Im)(4)(1,5nds) (two forms), and Ni(Im)(4)(1,5nds), contain direct sulfonate-metal coordination and represent the first such compounds with open d-shell transition metals without Jahn-Teller distortion. The two disulfonate ligands in these octahedrally coordinated metal centers are found in both trans- and cis-geometries and link the centers into chains. The chains are held together by charge-assisted hydrogen bonds between sulfonate and imidazole ligands from different chains. The remaining two compounds, Co(Im)(6)(1,5nds) x 2 H(2)O and Ni(Im)(6)(1,5nds) x 2 H(2)O, exhibit only charge-assisted hydrogen bonds between the octahedral M(Im)(6)(2+) cations and the disulfonate anions.
七种由二价金属-咪唑（Im）配合物（M(II) = Co、Ni 和 Mn）连接的具有框架结构的化合物通过 1,5-萘二磺酸盐（1,5nds）合成并进行了结构表征。其中五种化合物，Mn(Im)(4)(1,5nds)（两种形式）、Co(Im)(4)(1,5nds)（两种形式）和 Ni(Im)(4)(1,5nds)，含有直接的磺酸盐-金属配位，代表了具有开放 d 壳层过渡金属且没有 Jahn-Teller 扭曲的此类化合物中的首例。在这些八面体配位的金属中心中的两个二磺酸盐配体都处于顺式和反式两种几何形状，并将中心链接成链。链通过来自不同链的磺酸盐和咪唑配体之间的电荷辅助氢键保持在一起。其余两种化合物，Co(Im)(6)(1,5nds) x 2 H(2)O 和 Ni(Im)(6)(1,5nds) x 2 H(2)O，仅在八面体 M(Im)(6)(2+)阳离子和二磺酸盐阴离子之间存在电荷辅助氢键。
