研究生: |
施佩汝 SHIH PEI JU |
---|---|
論文名稱: |
柳亞苯丙胺酸混合配子四價釩氧錯合物的結構.光譜.鍵結能力及催化性質研究 |
指導教授: |
蘇展政
Su, Chan-Cheng |
學位類別: |
碩士 Master |
系所名稱: |
化學系 Department of Chemistry |
畢業學年度: | 87 |
語文別: | 中文 |
論文頁數: | 103 |
中文關鍵詞: | 柳亞苯丙胺酸 、高斯交疊解析 、鹵過氧 |
英文關鍵詞: | haloperoxidase, Gaussion analyses |
論文種類: | 學術論文 |
相關次數: | 點閱:115 下載:0 |
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本實驗以柳亞苯丙胺酸(sal-phe),5-硝基柳亞苯丙胺酸(nitro-sal-phe)及3-甲氧基柳亞苯丙胺酸(methoxy-sal-phe)為主配子,成功地合成了一系列四價釩的錯合物──VO(sal-D-phe)(L),VO(sal-L-phe)(L) ,VO(nitro-sal-D-phe)(L), VO(nitro-sal-L-phe)(L) 及VO(methoxy-sal-L-phe)(L)其中L為雙牙基或單牙基。雙牙基有1,10-二氮雜菲(1,10-phenanthroline),聯啶(bipyridine),及4,7二甲基-二氮雜菲(4,7dimethyl-phenanthroline)而單牙基為H2O,ROH。
利用元素分析,紅外線光譜,紫外光可見光光譜,電子順磁光譜,圓形二色光光譜,環伏安法及X-光結構解析方法完成錯合物結構的鑑定及鍵結性質的探討。
目前已完成X-光單晶結構解析的四價釩錯合物有:
(1)[VO(sal-D-phe)(OCH3)(HOCH3)]
斜方晶系(Orthorhombic),空間群為P21212,其晶格常數為:a=14.3954(4) A,b=18.9384(7) A,c=6.7507(2) A,V=1840.42(10) A3,Z=4,精算值為R=0.0534,wR2=0.1075
(5) (2)[VO(sal-D-phe)(H2O)]
單斜晶系(Monoclinic),空間群為P21,其晶格常數為:a=14.3954(4) A,b=18.9384(7) A,c=6.7507(2) A,=90o,=107.897(6)o ,=90o,V=795.9(3) A3,Z=2,精算值為R=0.0536,wR2=0.0847
(3)[VO(sal-L-phe)(OC9H9)(HOC9H9)]
單斜晶系(Monoclinic),空間群為P21,其晶格常數為:a=12.73800(10)A, b=7.9986(2)A,c=16.1993(3)A,=90o,=110.6570(6)o,=90o ,V=1544.375(3) A3,Z=2,精算值為R=0.0839 , wR2=0.1603
(4)[VO(methoxy-sal-L-phe)(dmphen)](H2O)
單斜晶系(Monoclinic),空間群為P21,其晶格常數為:a=6.3312(2)A;b=20.1158(6)A;c=11.1132(3)A,=90o,=98.1580(10)o ,=90o,V=1403.29(7) A3,Z=2,精算值為
R=0.0694 , wR2=0.1298
從晶體結構,EPR光譜,UV-VIS光譜和CD光譜可得知 [VO(sal-phe) (L)],[VO(nitro-sal-phe)(L)] 和[VO(methoxy-sal-phe)(L)]系列錯合物結構為扭曲八面體結構。且經由可見光光譜高斯交疊解析與CD光譜高斯交疊解析綜合結果分析,可得知[VO(sal-pheH)(OCH3)(HOCH3)]和[VO(nitro-sal-pheH)(OCH3)(HOCH3)]的d軌域能階分裂為:dz2>dyz>dxz>dx2-y2>dxy,而[VO(sal-phe)(NN)] 的d軌域能階分裂為:dz2>dyz>dx2-y2>dxz>dxy。
並且針對所合成的不對稱釩氧錯合物來作為進行溴化反應的催化劑,探討其催化性質。
ABSTRACT
Mixed-ligand oxovanadium(IV) complexes of 5-nitro-N-salicylidene-phenylalaninato, N-salicylidenephenylalaninato and 3-methoxy-N-salicylidene-phenylalaninato, [VO(sal-D-phe)(L)], [VO(sal-L-phe)(L)] ,[VO(5-NO2-sal-D-phe)(L)], [VO(5-NO2-sal-L-phe)(L)] and [VO(3-CH3O-sal-L-phe)(L)], where L=1,10-phenanthroline, 2,2’-bipyridine, 4,7-dimethyl-1,10-phenanthroline, H2O and ROH, have been synthesized and characterized by elemental analyses and UV/VIS, CD, IR, and EPR spectroscopic measurements.
By using three-dimensional X-ray diffraction methods, the crystal and molecular structures of the following four complexes have been determined:
(1) [VO(sal-D-phe)(OCH3)(HOCH3)]
Orthorhombic, space group P21212, a = 14.3954(4) A, b = 18.9384(7) A, c = 6.7507(2) A, V = 1840.4(1) A3, Z = 4, R = 0.0534, Rw = 0.1075.
(2) [VO(sal-D-phe)(H2O)]
Monoclinic, space group P21, a = 14.3954(4) A, b = 18.9384(7) A, c = 6.7507(2) A, = 107.897(6)o, V = 795.9(3) A3, Z = 2, R = 0.0536 , Rw = 0.0847.
(3) [VO(sal-L-phe)(OC9H9)(HOC9H9)]
Monoclinic, space group P21, a = 12.7380(1) A, b = 7.9986(2) A, c = 16.1993(3) A, = 110.6570(6)o, V = 1544.375(3) A3, Z = 2, R = 0.0839 , Rw = 0.1603.
(4) [VO(3-CH3O-sal-L-phe)(4,7-dmphen)](H2O)
Monoclinic, space group P21, a = 6.3312(2) A, b = 20.1158(6) A, c = 11.1132(3) A, = 98.158(1)o, V = 1403.29(7) A3, Z = 2, R = 0.0694 , Rw = 0.1298.
Based on EPR, UV/VIS and CD spectral data, the [VO(sal-phe)(L)], [VO(5-NO2-sal-phe)(L)] and [VO(3-CH3O-sal-phe)(L)] complexes have distorted octahedral structures in consistence with the X-ray structures. Gaussion analyses of the visible and CD spectra suggest the sequences of the d orbitals for [VO(sal-phe)(OCH3)(HOCH3)]- and [VO(5-NO2-sal-phe)(OCH3) (HOCH3)]- as dz2>dyz>dxz>dx2-y2>dxy and for the [VO(sal-phe)(NN)] as dz2>dyz>dx2-y2>dxz>dxy. The reduction potentials are higher for [VO(sal-phe)(NN)] than for [VO(sal-phe)(OCH3)(HOCH3)]- by about 400 mV, revealing that vanadyl complexes are greatly stabilized by NN ligands.
Preliminary studies on bromination of organic substrates catalyzed by asymmetric vanadyl complexes have been performed.
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