Abstract
Reduction of dichlorosilanes with Mg metal in the presence of LiCl and Lewis acid such as FeCl2 or ZnCl2 was found to be the highly practical method for the synthesis of polysilanes (PS). This method is so useful and practical that PS can be prepared by stirring dichlorosilanes at room temperature. This method was successfully applied for the synthesis of various types of PS having a linear structure, a cyclic structure and silane-styrene copolymers as another type of PS. The structure of the reaction intermediates was also analyzed. At the initiation stage the results of FD-MS (Field desorption mass spectrometry) and GPC (Gel permeation chromatography) showed that linear oligomers were mainly formed by stepwise reactions, and then the high polymers and cyclic oligomers were formed in parallel.
Highlights
IntroductionPolysilanes (PS) consisting of silicon-silicon bond chain (Figure 1) has attracted considerable attention due to their usefulness as the precursors for thermally stable ceramics [1] [2] materials for microlithography [3]-[5], materials for solar cell element [6] and coating materials for PE pipe connection [7] [8]
Polysilanes (PS) consisting of silicon-silicon bond chain (Figure 1) has attracted considerable attention due to their usefulness as the precursors for thermally stable ceramics [1] [2] materials for microlithography [3]-[5], materials for solar cell element [6] and coating materials for PE pipe connection [7] [8].In contrast to the growing interest with the PS, the method of preparation hitherto known is highly limited
The details of our method are described including mechanistic view points and we wish to report that it is successfully applied for the synthesis of various types of PS having a linear structure with high molecular weight, a cyclic structure, a linear structure with low molecular weight that is suitable for coating materials for PE [7] [8] and silane-styrene copolymers as another type of PS
Summary
Polysilanes (PS) consisting of silicon-silicon bond chain (Figure 1) has attracted considerable attention due to their usefulness as the precursors for thermally stable ceramics [1] [2] materials for microlithography [3]-[5], materials for solar cell element [6] and coating materials for PE pipe connection [7] [8]. This method, requires drastic reaction conditions and is very much limited as a practical method of PS. It has been reported in our previous studies, the reduction of dichlorosilane with Mg metal in the presence of Lewis acid (MCln) is highly useful method for the synthesis of PS under extremely mild reaction conditions (Scheme 1) [22]-[24]. The details of our method are described including mechanistic view points and we wish to report that it is successfully applied for the synthesis of various types of PS having a linear structure with high molecular weight, a cyclic structure, a linear structure with low molecular weight that is suitable for coating materials for PE [7] [8] and silane-styrene copolymers as another type of PS
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