Structures in solution of organophosphorus-lithium compounds
Structures in solution of organophosphorus-lithium compounds
复制标题
有机磷锂化合物溶液中的结构
DOI：
10.1080/03086648308075967
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发表时间：
1983
影响因子：
1.3
通讯作者：
W. Mcfarlane
中科院分区：
文献类型：
--
作者：
I. Colquhoun;H. Mcfarlane;W. Mcfarlane
有机磷锂化化合物Et2O溶液的低温31P和7Li核磁共振谱在30 ~ 50 Hz范围内分辨出耦合常数1J（31P-7Li）。这些光谱证明了物种的共价性质，也提供了有关分子结合状态的信息。[Ph2PLi]是对称二聚体，而[PhMePLi]是二聚体和三聚体的混合物。[PhHPLi]仅以一种形式存在，详细考虑31P和7Li的结果表明是三聚体结构。（PH2P）2CHLi和[PH2P][PH2P (S)]CHLi是共价单体。在二聚体和三聚体中，磷保留了一个电子孤对，并且这种键是多中心电子缺陷型的，就像在有机石中发现的那样。
Abstract Low temperature 31P and 7Li nmr spectra of Et2O solutions of lithiated organophosphorus compounds have resolved coupling constants 1J(31P-7Li) in the range 30–50 Hz. These spectra demonstrate the covalent nature of the species and also provide information regarding the state of molecular association. [Ph2PLi] is found to be a symmetrical dimer whilst [PhMePLi] gives a mixture of dimer and trimer. [PhHPLi] exists in only one form, detailed consideration of the 31P and 7Li results suggesting a trimeric structure. (PH2P)2CHLi and [Ph2P][Ph2P(S)]CHLi are found to be covalent monomers. it is proposed that in the dimers and trimers phosphorus retains an electron lone pair and that the bonding is of the multi-centre electron deficient type as found in the organolithuims themselves.