Studies on High Spin State Species based on Heavier Group 14 Element Radicals

2015 Fiscal Year Final Research Report

• Project/Area Number: 25410034
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Organic chemistry
• Research Institution: University of Tsukuba
• Principal Investigator: Ichinohe Masaaki 筑波大学, 数理物質系, 准教授 (90271858)
• Co-Investigator(Renkei-kenkyūsha): SEKIGUCHI Akira 筑波大学, 数理物質系, 教授 (90143164)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 有機ケイ素化合物 / ケイ素ラジカル / 有機ゲルマニウム化合物 / ゲルマニウムラジカル / 常磁性化学種 / 高スピン分子

Outline of Final Research Achievements

We succeeded in synthesizing and isolating of stable bis(silyl radical) connected by disilane chain, and determined its ground state as triplet. Furthermore, bis(germyl radical)s connected by meta-phenylene and para-phenylene spacer were also synthesized. Meta-phenylene bridged bis(germyl radical), which is non-Kekule; molecule;, has triplet ground state. One the other hand, para-phenylene bridged bis(germyl radical) has singlet ground state, but its singlet-triplet energy gap is quite low. Therefore, it was found that para-phenylene bridged bis(germyl radical) exists as an equilibrium mixture of singlet ground state and thermally accessible triplet excited state at high temperature such as room temperature.

Free Research Field

有機元素化学