Spectroscopic Studies of Nickel (II) and Nickel (III) Species Generated

16776 J. Phys. Chem., Vol. 100, No. 41, 1996

Additions and Corrections

ADDITIONS AND CORRECTIONS

Volume 100, 1996 A. Davidson, J. F. Tempere,* M. Che, H. Roulet, and G. Dufour : Spectroscopic Studies of Nickel(II) and Nickel(III) Species Generated upon Thermal Treatments of Nickel/CeriaSupported Materials Page 4925. A modified version of Table 2 is shown below. TABLE 2 symmetry Ni

I

elongated Oh

ground state

expected ESR sequence g| > g⊥ > ge

d

x2-y2

C2V

g| 2.28 2.766 2.53-2.62 2.280

g⊥ 2.15 2.114 2.10-2.11 2.087

giso 2.19 2.330 2.151

compound NiI/MgO NiI/NaF NiI/LiF PEt3

PEt3

ref 9 69 69 70

NiI O O (SiO2) (SiO2)

2.191

2.086/2.066

2.111

CO

52

CO NiI

O O (SiO2) (SiO2)

2.251

2.075/2.062

2.111

71

CO

CO NiI

O O (CaY) (CaY)

compressed Oh C3V

g⊥ > g| ∼ ge

d z2

2.067 2.065 2.009

2.464 2.353 2.140

2.332 2.257 2.096

NiI/NaF NiI/LiF

50 50 52

CO CO NiI

CO CO

O (SiO2)

2.001

2.154

X ) Cl

53a

X ) Br

PMe3

53a 51

La2Li0.5Ni0.5O4 NiIII/MgO reticular NiIII/TiO2 NiIII/SrTiO3 NiIII/CaO Sr1.5La0.5Ti0.5Ni0.5O4 interstitial NiIII/TiO2 NiIII/KTaO3

45 9 47 48 49 45 67 68

NiIII/Al2O3 NiIII/CeO2

69 d

2.103 NiI

C2V NiIIIb

elongated Oh

dz2

g⊥ > g| ∼ ge

compressed Oh

dx2-y2

g| > g⊥ > ge

g⊥ > g| ∼ ge

D3d

2.004 2.013

2.151 2.120

2.102 2.097

2.04 2.020 2.050 2.110 2.067 2.28 2.254 2.234 2.169 2.045 2.020

2.28 2.360 2.270/2.237 2.213 2.382 2.13 2.084/2.085 2.116 2.086 2.196 2.349

2.20 2.246 2.185 2.180 2.277 2.18 2.141 2.152 2.113 2.146 2.239

X

NiI O O (SiO2) (SiO2)

a In ref 53, NiI ions in a C b 3V geometry associated with a tripod chelate (tris(2-diphenylphosphinoethyl)amine) are described. A single ESR component centered near 2.196 has also been observed in MgO/NiO/Li2O materials and assigned to NiIII species.46 c D3d degenerated orbital mixture in which a Jahn-Teller effect is acting. d This work.

JP961898A