Enantiopure Calcium Iminophosphonamide Complexes: Synthesis, Photoluminescence, and Catalysis
作者:Bhupendra Goswami、Thomas J. Feuerstein、Ravi Yadav、Ralf Köppe、Sergei Lebedkin、Manfred M. Kappes、Peter W. Roesky
DOI:10.1002/chem.202004833
日期:2021.3
synthesis of calcium complexes ligated by three different chiral iminophosphonamide ligands, L‐H (L=[Ph2PN(R)CH(CH3)Ph}2]), L′‐H (L′=[Ph2PNDipp}N(R)CH(CH3)Ph}]), (Dipp=2,6‐iPr2C6H3), and L′′‐H (L′′=[Ph2PN(R)CH(CH3)naph}2]), (naph=naphthyl) is presented. The resulting structures [L2Ca], [L′2Ca], and [L′′2Ca] represent the first examples of enantiopure homoleptic calcium complexes based on this type
由三个不同的手性亚氨基膦酰胺配体L- H(L = [Ph 2 P N(R)CH(CH 3)Ph} 2 ]),L'- H(L' = [Ph 2 P NDipp} N(R)CH(CH 3)Ph}]),(Dipp = 2.6,i Pr 2 C 6 H 3)和L′′- H(L′′ = [Ph 2 P给出N(R)CH(CH 3)naph} 2 ]),(萘酚=萘基)。产生的结构[L 2 Ca],[ L' 2 Ca]和[ L'' 2 Ca]代表基于这种类型的配体的对映纯纯合钙复合物的第一个实例。钙络合物呈固态的蓝绿色光致发光(PL),在低温下尤其明亮。[ L'' 2 Ca]的发射与萘基的荧光有关,[ L 2 Ca]和[ L' 2Ca]是由长寿命的磷光和热激活的延迟荧光(TADF)引起的,在5–295 K的温度范围内,PL寿命有很大变化。此外,发现这些络合物在硼氢化硼氢化反应中具有出色的催化活性。