The occupied and unoccupied electronic structure of adsorbed ferrocene

Cobaltocene adsorption and dissociation on Cu(111)

“…1) at 9.0 ± 0.2 eV (peak B), 12.7 ± 0.2 eV (peak C), and 17.3 ± 0.2 eV (peak D) as well as the much weaker features at 0.9 ± 0.2 eV (peak A′) and 5.1 ± 0.2 eV (peak A″) are similar in relative intensities and binding energies to those assigned to cobaltocene adsorbed on cleaved graphite [32]. There is also a strong similarity between the gas phase photoemission spectra of cobaltocene [36][37], but with a shift of about 4 eV in the energy scale, as is typical of metallocenes [13][14][15], [17], [20][21][22][23], and [32], even though the moleculesubstrate as well as intermolecular interactions may shift, or broaden the molecular orbitals.…”

“…Such behavior has been observed for molecular ferrocene adsorption on Cu(1 0 0) [15], [21][22], Ag(1 0 0) [15], [21][22] and Mo(1 1 2) [17]. We see little evidence of changes in relative photoemission feature intensities in comparing photoemission spectra taken with s + p-polarized light (a light incidence angle of 40° off the surface normal) and more p-polarized light (a light incidence angle of 65° off the surface normal), even for several different photon energies, as seen in Fig.…”

“…When comparing initial cobaltocene adsorption on graphite [32] and Cu(1 1 1) (the work presented here) with other metallocenes, it seems fairly clear that cobaltocene is far less stable as a molecule on surfaces than ferrocene (Z − 1) [13][14][15][16][17][18][19][20][21][22] or nickelocene (Z + 1) [20], [23][24][25][26][27]. The big difference among these three metallocenes appears to be that the "nineteen electron" cobaltocene has a single unpaired electron resulting in a low ionization potential [32] of 5.56 eV [37] when compared to ferrocene (6.88 eV [37]) and nickelocene (6.51 eV [37]).…”

“…Of the many studies of molecular ferrocene [13][14][15][16][17][18][19][20][21][22], nickelocene [20][21][22][23][24][25][26][27][28][29][30][31] and cobaltocene [32] adsorption, the initial adsorption is associated (molecular) on most surfaces, when the adsorption is undertaken at substrate temperatures in the region of 100-200 K. Molecular metallocene adsorption has been observed on Ag(1 0 0) [13][14][15], [21], [22], [26], and [27], Cu(1 0 0) [15], [19], [21][22][23][24][25], Mo(1 1 2) [17] and [22], graphite [16], [18], and [32] and Si(1 1 1)-2 × 1 [20]. Nonetheless, initial nickelocene adsorption on Ni(1 0 0) [25] and NiO(1 0 0) [25] is dissociative even for substrate temperatures of 135 K. We might expect that cobaltocene adsorption, like that observed for other metallocenes, would also be molecular on substrates well below r...…”

Radiation-induced decomposition of the metal-organic molecule Bis(4-cyano-2,2,6,6-tetramethyl-3,5-heptanedionato)copper(II)

“…Modification of a layer of large organometallic and metal-organic molecules, by way of radiation exposure, is not only very possible, but common also. For example, the decomposition of a number of metallocenes, as a result of ultraviolet radiation has been investigated including nickelocene [1], cobaltocene [2] and ferrocene [3,4]. Photochemical decomposition of cobalt phthalocyanine (CoPc) [5] and tris-(8-hydroxy quinoline aluminum (Alq 3 ) [6] has also been investigated, among many other species.…”