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Low-Energy Photoelectron Imaging Spectroscopy of Lan(benzene) (n = 1 and 2)
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2017-10-30 00:00:00 , DOI: 10.1021/acs.jpca.7b09750 W. Ruchira Silva 1 , Wenjin Cao 1 , Dong-Sheng Yang 1
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2017-10-30 00:00:00 , DOI: 10.1021/acs.jpca.7b09750 W. Ruchira Silva 1 , Wenjin Cao 1 , Dong-Sheng Yang 1
Affiliation
Lan(benzene) (n = 1 and 2) are formed in a pulsed laser-ablation molecular beam source and characterized by low-energy photoelectron imaging spectroscopy. The photoelectron spectrum of La2(benzene) displays a strong origin band, a short metal–ligand stretching progression, and a weak ring deformation band. Four isomers are considered for La2(benzene), and the preferred structure is an inverse sandwich with two La atoms residing on the opposite sides of the benzene ring. The ground electronic state of the inverse sandwich is 1A1g (D3d) with (5dxy,x2–y2 + π*)46s2 electron configuration. Ionization removes a La-based 6s electron and yields a 2A1g ion. The spectrum of La(benzene) is similar to the zero-electron kinetic energy spectrum reported previously by our group, although the spectral line width is somewhat broader. The measurement of the photoelectron angular distribution of La(benzene) confirms that the ejected electron has largely a p wave character. The metal–ligand bonding of La2(benzene) is considerably stronger than that of La(benzene) due to the threefold binding of each La atom in the dilanthanum species and the twofold binding in the monolanthanum complex.
中文翻译:
La中的低能光电子光谱成像Ñ(苯)(Ñ = 1和2)
La n(苯)(n = 1和2)在脉冲激光烧蚀分子束源中形成,并通过低能光电子成像光谱进行表征。La 2(苯)的光电子能谱显示出很强的原始带,短的金属-配体拉伸过程和弱的环形变带。对于La 2(苯),考虑了四个异构体,并且优选的结构是在苯环的相对侧上具有两个La原子的反三明治。反向三明治的接地电子状态为1 A 1g(D 3 d),其中(5d xy,x 2 - y2 +π*) 4 6s 2电子构型。电离会去除La基的6s电子,并产生2 A 1g离子。La(苯)的光谱类似于我们小组先前报道的零电子动能光谱,尽管光谱线宽稍宽。La(苯)的光电子角分布的测量证实了所喷射的电子具有很大的p波特性。La 2(苯)的金属-配体键合比La(苯)的键合键强得多,这是因为每个La原子在双镧物种中具有三重结合,而在单镧配合物中则具有二重结合。
更新日期:2017-10-31
中文翻译:
La中的低能光电子光谱成像Ñ(苯)(Ñ = 1和2)
La n(苯)(n = 1和2)在脉冲激光烧蚀分子束源中形成,并通过低能光电子成像光谱进行表征。La 2(苯)的光电子能谱显示出很强的原始带,短的金属-配体拉伸过程和弱的环形变带。对于La 2(苯),考虑了四个异构体,并且优选的结构是在苯环的相对侧上具有两个La原子的反三明治。反向三明治的接地电子状态为1 A 1g(D 3 d),其中(5d xy,x 2 - y2 +π*) 4 6s 2电子构型。电离会去除La基的6s电子,并产生2 A 1g离子。La(苯)的光谱类似于我们小组先前报道的零电子动能光谱,尽管光谱线宽稍宽。La(苯)的光电子角分布的测量证实了所喷射的电子具有很大的p波特性。La 2(苯)的金属-配体键合比La(苯)的键合键强得多,这是因为每个La原子在双镧物种中具有三重结合,而在单镧配合物中则具有二重结合。