- 作者: 魏和祥; 門立中
- 作者服務機構: 私立淡江文理學院化學研究所
- 中文摘要: 合成一系列之化台物,如Fe(RCO-py)2Cl2 (R有2 3或4位置之CH3, C6H5,H. OH及NH2)之後,用IR,UV,磁性測其構造及物性,然後用Mossbauer光譜加以探討Fe (II)之電子狀態。結果,這些化合物無論單配位(2-位置RCO)或雙配位(3或4-位置RCO) 口比口定鐵(11)錯鹽,皆是high-spin八面體結構。從M6ssb-auer資料,顯示雙配位化合物之△EQ (Quadrupole Splitting)大於單配位化合物之△EQ。約2--3倍。由配位場理論求算得知t2g軌道分裂大小關係所引起的結果。本研究結果顯示Mossbauer光譜不單單很清楚地區分單配位及雙配位化合物之特性,同時提供進一步暸解鐵(II)之電子狀態與Ligand結合之情形。
- 英文摘要: A number of complexes of iron (II) chlorides with 2-, 3-and 4-positioncarbonyl-substituted pyridines, i.e. Fe(RCO-py)2Cl2 (R=CHs, C6H5, H, OH,and NH2) have been prepared and characterized by means of Mossbauer,infrared spectroscopy and magnetic measurements. These complexes areshown to have distorted octahedral structures. The magnitudes of quadrupolesplittings (△EQ) of Mossbauer spectra for 2-position substituted complexsare much larger than those of 3-, or 4-position substituted complexes,sinceamong the 2-and 3-, 4-derivatives are not the same chelating forms: bidentatefor 2-substituted complexes and monodentate for 3-, or 4-substituted com-plexes. The ground state of 3d orbitals of iron in complexes was assignedand the energy separation of t2g,was estimated. The effect on the isomershift of a substituent groups(R) of 2-position substituted complexes wasdiscussed.
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