Steckel Jonathan S, Yen Brian K H, Oertel David C, Bawendi Moungi G
Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge 02139, USA.
J Am Chem Soc. 2006 Oct 11;128(40):13032-3. doi: 10.1021/ja062626g.
On the basis of evidence from 31P NMR spectroscopy, and using PbSe as a model, we propose two simultaneous mechanisms through which "monomers" are formed in preparations of lead chalcogenide nanocrystals (NCs). In one mechanism, selenium is delivered as a Se2- species, whereas in the other, Se0 reacts with metal already reduced by the organophosphine. This latter mechanism helps explain the sensitivity of NC preparations to the purity of organophosphines and allows the rational modification of batch NC reactions to increase yield.
基于31P核磁共振光谱的证据，并以PbSe作为模型，我们提出了两种同时存在的机制，通过这些机制，在硫族铅化物纳米晶体（NCs）的制备过程中形成了“单体”。在一种机制中，硒以Se2-物种的形式传递，而在另一种机制中，Se0与已经被有机膦还原的金属发生反应。后一种机制有助于解释NC制备对有机膦纯度的敏感性，并允许对批量NC反应进行合理改性以提高产率。
