Light-Induced Excited-Spin-State Trapping: Evidence from VTFTIR Measurements
Light-Induced Excited-Spin-State Trapping: Evidence from VTFTIR Measurements
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光致激发自旋态捕获：来自 VTFTIR 测量的证据
DOI：
10.1002/chin.198629039
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
L. Casson
中科院分区：
文献类型：
--
作者：
R. Herber;L. Casson
由Cambi等人在Fe3+的三(二硫代氨基甲酸)络合物中首次发现的具有d4至d7电子构型的第一排过渡金属络合物中的热驱动自旋交叉现象在文献中得到了广泛的综述。特别是，Gutlich等人利用~(57)Fe穆斯堡尔谱和磁化率测量对d$-FeN(Phen)_2(SCN)_2的5T2(高自旋，HS)-‘A(低自旋，LS)相变进行了相当详细的研究，用~(57)Fe穆斯堡尔谱和磁化率测量来表征从S’=2到S=0组态的跃迁随温度的变化。Fe(Phen)2(SCN)2的磁性行为最初是由Baker和Bobonich观察到的，他们注意到自旋转变非常尖锐，在~175K时发生在固体中，在升温和冷却循环中几乎没有磁滞。特别值得注意的是，这种化合物不仅在HS和LS形式之间存在预期的特征灵敏度差异，而且两个自旋态的穆斯堡尔谱和红外特征都有显着的不同，这使得我们能够详细研究交叉现象的热力学。这个
The phenomenon of thermallydriven spin crossover in first-row transition-metal complexes, with electron configurations d4 to d7, which was first demonstrated in tris (dithiocarbamato) complexes of Fe3+ by Cambi et al., 1 has been extensively reviewed in the literature. In particular, the 5T2 (high-spin, HS)-'A (low-spin, LS) transition in d $-Fen (phen) 2 (SCN) 2 has been studied in considerable detail by Gutlich et al., 2" 5 who have made use of 57Fe Mossbauer spectroscopy and susceptibility measurements to characterize the temperature dependence of the transitionfrom the S'= 2 to the S= 0 configuration of the complex. The magnetic behavior of Fe (phen) 2 (SCN) 2 had been originally observed by Baker and Bobonich, 6 who noted that the spin transition is very sharp and occurs at~ 175 K in the solid, with little or no hysteresis during warming and cooling cycles. In particular it is interesting to note that not only is there the expected characteristic suscep-tibility difference between the HS and LS form of this compound but in addition both the Mossbauer and infrared signatures of the two spin states are significantly different and permit a detailed study of the thermodynamics of the crossover phenomenon. The