沈金銘 崔術(shù)新 包雙 邢樂(lè)紅
摘 要:采用密度泛函理論和對(duì)稱(chēng)性破損態(tài)方法(DFT-BS),研究氰酸橋聯(lián)雙核銅配合物的磁性.結(jié)果表明,用混合密度泛函(B3LPY,B3P86,B3PW91)計(jì)算所獲得的結(jié)果與實(shí)驗(yàn)值符號(hào)相同,B3P86/SDD水平下的計(jì)算結(jié)果與實(shí)驗(yàn)值最接近;其單占據(jù)分子軌道SOMOs能量劈裂小,兩個(gè)Cu離子間有弱的鐵磁作用,該配合物存在自旋離域效應(yīng).
關(guān)鍵詞:氰酸;銅配合物;密度泛函理論;對(duì)稱(chēng)性破損態(tài);磁性
[中圖分類(lèi)號(hào)]O 646.8 [文獻(xiàn)標(biāo)志碼]A
Abstract:In the present work, the magnetic properties of copper(II) complex were studied using the broken symmetry (BS) approach together with density functional theory (DFT). The results show that the Jab value calculated with the B3LYP method has a large dependence on the basis set. The B3LYP/SDD level identifies the best Jab to be Jab=0.66cm-1 for copper(II) complex, which is consistent with the experimental valve (Jab=0.5cm-1). Furthermore, energy level splitting causes ferromagnetic interactions in the target copper(II) system.
Key words:Cyanate Bridged Complex; Dinuclear Copper; DFT; BS; Magnetic
金屬配合物材料因具有密度小、透明度高、易于加工等優(yōu)良性質(zhì),在太陽(yáng)能電池、磁記錄材料和生物兼容材料等領(lǐng)域廣泛應(yīng)用,金屬配合物磁性材料的研究也成為最為活躍的研究熱點(diǎn)之一.[1-3]
3 結(jié)論
本文應(yīng)用對(duì)稱(chēng)性破損態(tài)法結(jié)合密度泛函理論,研究鐵磁性雙核Cu(Ⅱ)配合物[Cu(L)(NCO)]2(PF6)2,采用混合密度泛函(DFT)(B3LYP,B3P86,B3PW91)和3種基組(LANL2DZ,SDD,6-31G)計(jì)算配合物離子的耦合常數(shù).結(jié)果表明,在B3LYP/SDD水平下計(jì)算所得結(jié)果與實(shí)驗(yàn)數(shù)據(jù)最吻合,通過(guò)單占據(jù)軌道SOMO的分布方式、軌道能量劈裂、Mulliken布局分析研究磁交換機(jī)制,配合物SOMOs軌道的重疊說(shuō)明配合物具有鐵磁作用,軌道間的能量劈裂較小是配合物顯示弱的鐵磁性的原因, 由Mulliken布局分析配合物存在自旋離域效應(yīng).
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編輯:吳楠