臺灣博碩士論文加值系統

錯合物磁性之基本理論乃源自金屬錯合物的電子自旋狀態,而經由分子的
設計,可預測得錯合物不同的磁交換性質.一般而言,磁性物質可分為軟式
和硬式兩種,軟式磁性物質具有易磁化及易去磁化的特質,可作為發電機核
心,電磁錄音,錄影的材料,相反的,硬式磁性物質具有不易磁化及不易去磁
化的性質,可作為製造擴大機,接收器等的材料,由於分子磁性物質有相當
大的可塑性及在有機溶劑中可溶等特質 ,所以其在工業上的應用將更為廣
泛.於本論文中,是以有機自由基NITpPy為配位基,利用其與不同中心金屬
的乙醯丙酮和六氟乙醯丙酮以及氯化合物反應,希望藉著中心金屬自旋狀
態的改變,而得到具有較強分子內和分子間交互作用力及較高臨界轉換溫
度的鐵磁性分子磁性物質.此系列錯合物乃以變溫磁性數據,IR光譜,ESR光
譜和X-射線單晶結構對其結構及自旋狀態做一探討.由結果得知,除了配位
基NITpPy為分子間鐵磁性偶合作用外 (Tc=11K),其餘的錯合物不論是與順
磁性或逆磁性中心金屬鍵結,均為相當微弱的反鐵磁性偶合作用,造成這個
現象的原因除了與磁性軌域的位向有關外,自旋與自旋的距離很遠是為很
重要的因素,磁交換作用參數J值乃以理論曲線fitting估計求得.

The magnetic properties of the metal complexes are most
originated from the electronic spin ststes of the metal ions.We
can predict the different magnetic properties from the
complexes through the moleculars. In present thesis,the organic
radical,NITpPy,reacts with different metal complexes of
acetylacetonates,hexafluoac- etylacetonates and chlorides. We
hope to get ferromagnetic molecular-base materials with strong
inter- or intramolecular interaction and high critical
transition temperture by changing the spin states of the metal
centers. The complexes of this series of susceptibilities,IR,
ESR spectra and crystal structure determinations for the
organic radical ,NITpPy,and its derivatives are discussed. The
results reveal that all the complexes with paramagnetic or
diamagnetic metals are very weak antiferromagnetic interaction
exception of the NITpPy ligand(is intermolecular ferromagnetic
interaction and it critical temperture is 11K).The interaction
parameter of J values have been estimated by theoretical curve
fitting.