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Atropisomeric Discrimination in New Ru~(II)Complexes Containing the C_2-Symmetric Didentate Chiral Phenyl-1,2-bisoxazolinic Ligand

机译:含C_2对称的手性苯基1,2,2-二恶唑啉配体的新Ru〜(II)配合物中的对映异构

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A new family of Ru~(II)complexes containing the tridentate meridional 2,2':6',2"-terpyridine(trpy)ligand,a C_2-symmetric didentate chiral oxazolinic ligand 1,2-bis[4'-alkyl-4',5'-dihydro-2'-oxazolyl]benzene(Phbox-R,R = Et or z'Pr),and a monodentate ligand,of general formula[Ru(Y)-(trpy)(Phbox-R)]~(n+)(Y = Cl,H_2O,py,MeCN,or 2-OH-py(2-hydroxypyri-dine))have been prepared and thoroughly characterized.In the solid state the complexes have been characterized by IR spectroscopy and by X-ray diffraction analysis in two cases.In solution,UV/Vis,cyclic voltammetry(CV),and one-dimensional(ID)and two-dimensional(2D)NMR spectroscopy techniques have been used.We have also performed density functional theory(DFT)calculations with these complexes to interpret and complement experimental results.The oxazolinic ligand Phbox-R exhibits free rotation along the phenyloxazoline axes. Upon coordination this rotation is restricted by an energy barrier of 26.0 kcalmol~(-1)for the case of[Ru-(trpy)(Phbox-iPr)(MeCN)]~(2+)thus preventing its potential interconversion.Furthermore due to steric effects the two atropisomers differ in energy by 5.7k calmol~(-1)and as a consequence only one of them is obtained in the synthesis.Subtle but important structural effects occur upon changing the monodentate ligands that are detected by NMR spectroscopy in solution and interpreted by using their calculated DFT structures.
机译:含三齿2,2':6',2“-叔吡啶(trpy)配体的三齿子午线新的Ru〜(II)配合物家族,C_2对称二齿手性恶唑啉配体1,2-双[4'-烷基-具有通式[Ru(Y)-(trpy)(Phbox-R)的4',5'-二氢-2'-恶唑基]苯(Phbox-R,R = Et或z'Pr)和单齿配体已经制备并彻底表征了]〜(n +)(Y = Cl,H_2O,py,MeCN或2-OH-py(2-hydroxypyri-dine))。在固态下,通过红外光谱对复合物进行了表征,并在两种情况下通过X射线衍射分析。在溶液中,使用了UV / Vis,循环伏安法(CV)和一维(ID)和二维(2D)NMR光谱技术。我们还进行了密度泛函分析恶唑啉配体Phbox-R沿苯恶唑啉轴自由旋转,在配位时受26.0 kcalmol〜(-1)的能垒限制。 [Ru-(trpy)(Phbox-iPr)的(MeCN)]〜(2+)从而阻止其潜在的相互转化。此外,由于空间效应,两种阻转异构体的能量相差5.7k Calol〜(-1),因此在合成中仅获得了其中的一种。但是重要的结构效应发生在改变溶液中NMR光谱检测到的单齿配体并通过使用其计算的DFT结构进行解释时。

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