Infrared spectra cerium

Their cerium complex is reported as stable to air and acid (although decomposed by hot nitric acid), properties which are not consistent with those of the known bis([8]annulene)actinide(IV) complexes. The infrared spectrum of their complex is also inconsistent with the presence of a planar [8]annulene ligand. We have attempted to duplicate the synthesis of cerocene by the method of Kalsotra, Multani, and Jain and have not been able to reproduce their reported results. 

The characterization of this complex, especially the infrared spectrum, x-ray powder pattern, mass spectrum and iH-NMR (Ce(lV) is diamagnetic) is consistent with a bis([8]annulene)cerium(lV) complex that is isostructural with uranocene. We have duplicated the work by Greco and co-workers and our results verify their work in every detail, except for the alcoholysis results, which will be discussed below. 

The green cerium complex was characterized by elemental analysis and infrared spectrum. The structure of this complex is not known, but its... 

In this complex, the bis([8]annulene)cerate(II) complex is formally a dianion. The cerium complex as its di(l,2-dimethoxyethane) adduct was characterized by elemental analysis and infrared spectrum. The structure of [K(C Hjq02)]2[Ce(CgHg)2] is not known, but the infrared spectrum of the cerium complex does contain bands (887 and 682 cm-i) which are consistent with the presence of an [8]annulene dianion.S7 Although there are reports of Ce(II) from the reduction of Ce(III) in other systems,58,59 the presence of the cerium(II) ion in... 

This bimetallic complex was characterized by elemental analysis, infrared spectrum and mass spectrum. The infrared indicates that the eight-membered ring is present as [8]annulene. It was suggested from the mass spectrum and iH-NMR studies that this complex exists with the isopropoxide ligands bridging between the cerium and aluminum ions (Figure 11). The bimetallic [8]annulene complex has also been made as its acetonitrile adduct. 7... 

Optical Absorption Spectra and Electronic Structure The optical spectra of all the doubledeckers are listed in Table I, On first glance, Ce(0EP)2 has a "normal" spectrum (7), However, the spectrum shows extra bands and therefore should be called "hyper", A small band appears at 467 nm (maybe a ligand-to-metal charge transfer band), and broad features extend far into the near infrared (NIR), The latter absorption may be due to exciton interactions. Contrary to the known rare earth monoporphyrins (7), it has been shown for the closely related cerium(IV)... 

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