1998 Fiscal Year Final Research Report Summary
Hypervalent bond of main-group metal and its electric conductivity
| Project/Area Number |
09640690
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
機能・物性・材料
|
|---|
| Research Institution | HIROSHIMA UNIVERSITY |
|---|
Principal Investigator |
YAMADA Koji FACULTY OF SCIENCE DEPARTMENT OF CHEMISTRY,HIROSHIMA UNIVERSITY ASSOCIATE PROFESSOR, 理学部, 助教授 (10166704)
|
|---|
| Project Period (FY) |
1997 – 1998
|
| Keywords | Main-group metal / Hypervalent bond / Three-center-four-electron bond / Electronic conductivity / Ionic conductivity |
|---|
| Research Abstract |
In our study of the halocomplexes of main group metals, we have found interesting electric properties, i.e., electronic conductivity and ionic conductivity. Electronic conductivity was found for perovskites AsnBr_3 (A Cs, CH_3NH_3) and these crystals were studied by means of X-ray diffraction, ^1^1^9Sn NMR and ^81^1Br NQR.At the low temperature phase of CH^3NH^3SnBr_3, the anionic sub-lattice deformed considerably and its conductivity decreased to an order of an insulator. A characteristic trans effect between bonds, Sn-Br and its trans Sn-Br, was confirmed at the low temperature phases of CH_3NH_3SnBr_3.
Ionic conductivity, on the other hand, was found for fluorides such as KSbF_4, KSn_2F_5, and RbPbF_3. These crystals were investigated by means of ^1@S9@E1F, ^1^1^9Sn, ^8@S7@E1Rb NMR and X-ray diffraction followed by a Rietveld analysis.
These electric properties were discussed on the basis of the structure and the hypervalent nature of the central metals.
|
