Lanthanide Class of a Trinuclear Enantiopure Helical Architecture Containing Chiral Ligands: Synthesis, Structure, and Properties
作者:Marco Lama、Olimpia Mamula、Gregg S. Kottas、Fabio Rizzo、Luisa De Cola、Asao Nakamura、Reiko Kuroda、Helen Stoeckli-Evans
DOI:10.1002/chem.200700324
日期:2007.9.7
carboxylic derivatives (+)- and (-)-HL, designed to form configurationally stable lanthanide complexes, proved their effectiveness as chiral building blocks for the synthesis of lanthanide-containing superstructures. Indeed a self-assembly process takes place with complete diastereoselectivity between the enantiomerically pure ligand L(-) and Ln(III) ions (La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er), thus
旨在形成构型稳定的镧系元素络合物的pin烯-联吡啶羧酸衍生物(+)-和(-)-HL证明了其作为合成含镧系元素超结构的手性构件的有效性。实际上,在对映体纯的配体L(-)和Ln(III)离子(La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er)之间发生了具有完全非对映选择性的自组装过程,从而导致定量形成具有通式[Ln(3)(L)(6)(mu(3)-OH)(H(2)O)(3)](ClO(4))( 2)(缩写为tris(Ln [L](2)))。这类C(3)对称化合物的结构形式为固态和溶液。电喷雾(ES)质谱和(1)H NMR光谱分析表明,三核物质保持在溶液(CH(2)Cl(2))中,并且在研究的浓度范围内稳定(10(-2)-10( -6)m)。在室温和77 K下研究了配体HL及其tris(Ln [L](2))配合物的光物理性质,从而证明了以金属为中心的发光对可见光和近红外发射体都非常敏感。