首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Chiral or not chiral? A case study of the hexanuclear metalloprisms [Cp*6M6(mu_3-tpt-kappa N)2(mu-C2O4-kappa O)3]~(6+)(M = Rh,Ir,tpt = 2,4,6-tri(pyridin-4-yl)-1,3,5-triazine)
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Chiral or not chiral? A case study of the hexanuclear metalloprisms [Cp*6M6(mu_3-tpt-kappa N)2(mu-C2O4-kappa O)3]~(6+)(M = Rh,Ir,tpt = 2,4,6-tri(pyridin-4-yl)-1,3,5-triazine)

机译:手性与否?六核金属毒理学[Cp * 6M6(mu_3-tpt-kappa N)2(mu-C2O4-kappa O)3]〜(6 +)(M = Rh,Ir,tpt = 2,4,6-三(吡啶-4-基)-1,3,5-三嗪)

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摘要

Cationic hexarhodium and hexairidium complexes with a trigonal prismatic architecture have been synthesised in good yield by self-assembly of the dinuclear oxalato-bridged complexes [Cp*2M2(mu-C2O4-kappa O)Cl2](M = Rh;1:Ir;2)with 2,4,6-tri(pyridine-4-yl)-1,3,5-triazine(tpt)in the presence of AgO3SCF3.The trigonal prismatic cations [Cp*6Rh6(mu_3-tpt-kappa N)2(mu-C2O4-KO)3]~(6+)(3)and [Cp*6Ir6(mu_3-tpt-kappa N)2(mu-C2O4-kappa O)3]~(6+)(4)have been isolated as their triflate salts.The single-crystal X-ray structure analysis of [3][O3SCF3]6 shows two enantiomers in the racemic crystal(space group C2/c),the chirality being due to a twist of the two tpt units.By contrast,the single-crystal X-ray structure analysis of [4][O3SCF3]6 shows a perfectly eclipsed conformation of the tpt units,so that 4 is not chiral in the crystal state(space group Fd3c).However,in solution,enantiodifferentiation in the presence of the chiral anion A-BINPHAT is observed by ~1H NMR spectrometry not only in the case of 3,but also in the case of 4.This suggests that the iridium derivative 4,which is not chiral in the solid state,adopts chiral conformations in solution.
机译:通过自组装双核草酸酯桥联的络合物[Cp * 2M2(mu-C2O4-kappa O)Cl2](M = Rh; 1:Ir; 2)在AgO3SCF3存在下与2,4,6-三(吡啶-4-基)-1,3,5-三嗪(tpt)在一起。三棱柱形阳离子[Cp * 6Rh6(mu_3-tpt-kappa N) 2(mu-C2O4-KO)3]〜(6 +)(3)和[Cp * 6Ir6(mu_3-tpt-kappa N)2(mu-C2O4-kappa O)3]〜(6 +)(4) [3] [O3SCF3] 6的单晶X射线结构分析显示,外消旋晶体中存在两个对映异构体(空间群C2 / c),其手性是由于两者的扭曲相比之下,[4] [O3SCF3] 6的单晶X射线结构分析显示出tpt单元的完美黯淡构象,因此4在晶体状态下不是手性的(空间群Fd3c)。 ,在手性阴离子A-BINPHAT的存在下,溶液中的对映体差异通过〜1H NMR光谱观察到,不仅在的3,但在4的情况下也是如此。这表明铱衍生物4(不是固态的手性)在溶液中采用手性构象。

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