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JKMRS Volume 17, No 1 24-29; Structural Characteristics of 3- ...
2013년 06월 20일 / 조회수: 456

Structural Characteristics of 3- and 4-Coordinate Borons from 11B MAS NMR and Single-Crystal NMR in the Nonlinear Optical Material BiB3O6

 

 

Woo Young Kim1 and Ae Ran Lim1,2,*

 

 

1Department of Carbon Fusion Engineering, Jeonju University, Jeonju 560-759, Korea

2 Department of Science Education, Jeonju University, Jeonju 560-759, Korea

 

 

Received April 5, 2013; Revised June 04, 2013; Accepted June 10, 2013

 


Abstract   The structural characteristics of 4-coordinate BO4 [B(1)] and 3-coordinate BO3 [B(2)] groups in BiB3O6 were studied by 11B magic angle spinning (MAS) and single-crystal nuclear magnetic resonance (NMR) spectroscopy. The spin–lattice relaxation time in the laboratory frame, T1, for 11B decreased slowly with increasing temperature, whereas the spin–lattice relaxation times in the rotating frame, T, for B(1) and B(2), which differed from T1, were nearly constant. Further, T for B(1) and B(2) showed very similar trends, although the T value of B(2) was shorter than that of B(1). The 3-coordinate BO3 and 4-coordinate BO4 were distinguished by 11B MAS NMR spectrum and T.

 

 

Keywords   BiB3O6, Boron, Nonlinear optical material, MAS NMR, Spin–lattice relaxation time

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