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Anion-Induced Assembly of Five-Coordinated Mercury(II) Complexes and Density Functional Theory Calculations to Study Bond Dissociation Energies of Long Hg N Bonds

机译:阴离子诱导的五配位汞(II)配合物的组装和密度泛函理论计算,以研究长Hg N键的键离解能

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A series of new five-coordinated mercury(II) coordination complexes (Hg(TpzT)(SCN)(2)center dot H2O (1), Hg(TpzT)I-2 center dot H2O (2), Hg(TpzT)Br-2 center dot H2O (3), 2Hg(TpzT)Cl-2 center dot HgCl2 center dot 2H(2)O (4)) have been synthesized by self-assembling the flexible ligand 2,4,6-tri(pyrazole-1-yl)-1,3,5-triazine (TpzT) with HgX2 (X = SCN, I, Br, Cl). Various weak interactions including hydrogen bonds (O-H center dot center dot center dot X, C-H center dot center dot center dot X), pi-pi interactions, and S center dot center dot center dot S contacts play significant roles in the final topological structures of the four compounds. Unexpectedly, 5 and 6 were obtained accidentally by self-assembling TpzT with MX2 (Zn(NO3)(2)center dot 6H(2)O or CdI2) in methanol and were assessed by X-ray crystallography, which indicated that there are nucleophilic substitution reactions. Surprisingly, all the Hg-N bonds of approximately 2.70 angstrom in length formed by the tridentate ligand and mercuric salt are rather unusual. So density functional theory (DFT) calculations (Amsterdam density functional, ADF) were employed to study the bond dissociation energies (BDE) of Hg-N bonds in 1-4 to assess the nature of the bonds. The calculation reveals the strong coordination nature of Hg-N bonds in 1-4 compared to that of the same coordination mode of compound A ((4'-(4-[4-(imidazole)phenylethylene]phenyl)-2,2':6',2 ''-terpyridine)HgBr2 center dot CHCl3) with the normal range Hg-N bond lengths. And a similar trend is that the larger the anion and BDE become, the steadier the coordination complexes are.
机译:一系列新的五配位汞(II)配合物(Hg(TpzT)(SCN)(2)中心点H2O(1),Hg(TpzT)I-2中心点H2O(2),Hg(TpzT)Br -2中心点H2O(3),2Hg(TpzT)Cl-2中心点HgCl2中心点2H(2)O(4))是通过自组装柔性配体2,4,6-三(吡唑- 1-yl)-1,3,5-三嗪(TpzT)与HgX2(X = SCN,I,Br,Cl)。各种弱相互作用,包括氢键(OH中心点中心点中心点X,CH中心点中心点中心点X),pi-pi相互作用和S中心点中心点中心点S接触在硅酮的最终拓扑结构中起着重要作用。这四种化合物。出乎意料的是,在甲醇中通过将MX2(Zn(NO3)(2)中心点6H(2)O或CdI2)与MX2自组装而意外获得了5和6,并通过X射线晶体学对其进行了评估,表明存在亲核性取代反应。出人意料的是,由三齿配体和汞盐形成的所有长度约为2.70埃的Hg-N键都是非常不寻常的。因此,采用密度泛函理论(DFT)计算(阿姆斯特丹密度泛函,ADF)研究了1-4中Hg-N键的键离解能(BDE),以评估键的性质。计算表明,与化合物A((4'-(4- [4- [4-(咪唑)苯基乙烯]苯基)-2,2'的)相同配位方式相比,Hg-N键在1-4中具有很强的配位性质。 :6',2''-三联吡啶)HgBr2中心点CHCl3),具有正常范围的Hg-N键长。同样的趋势是阴离子和BDE越大,配位化合物越稳定。

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