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Vibronic interactions in the stereochemistry of metal complexes

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Part of the book series: Structure and Bonding ((STRUCTURE,volume 71))

Abstract

A survey of the theoretical foundations of vibronic interactions in molecular systems, with special attention to metal complexes, is given. A detailed analysis of the conditions leading to the adiabatic potential surface in various degrees of generality represents the central idea of the article. Use of the partitioning method enables consideration of the Jahn-Teller effect, the Renner-Teller effect and the pseudo Jahn-Teller effect on an equal footing. Analytic forms of the adiabatic potential surfaces are rederived for the most important cases by including the totally symmetric vibrational mode up to the second order of vibronic expansion. A complete third-order formula for the adiabatic potential surface of Eg − (a1g + eg) vibronic coupling is presented. The consequences for structural features of molecular systems are discussed and exemplified by various metal complexes. Recent progress in molecular-orbital calculations of vibronic constants is reviewed.

This paper deals with pure (pseudo) Jahn-Teller effect only. On the other hand, some qualitatively new types of interaction may arise due to interaction of (pseudo) Jahn-Teller centers with the lattice. We do not consider the competitive spin-orbit-lattice coupling that may arise below a magnetic-ordering temperature at Jahn-Teller ions with a threefold orbital degeneracy. Inclusion of interactions like this is, however, outside the scope of the present work.

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Abbreviations

a:

symmetry of vibration

A:

symmetry of electron state; vibronic constant

APS:

adiabatic potential surface

AOM:

Angular Overlap Model

b:

symmetry of vibration

B:

symmetry of electron state; vibronic constant

Ci :

matrix of coupling coefficients

CG:

Clebsh-Gordan coefficient

CNDO:

Complete Neglect of Differential Overlap

e:

symmetry of vibration

E:

symmetry of electron state; energy, eigenvalue of Schrödinger equation

fk :

nuclear (vibration) function

Fi, Fij, Fijk...:

pure nuclear term of force constants

G:

symmetry point group

Ĝ1k :

nonadiabatic coupling operator

Ĥ:

Hamiltonian

Hkl :

matrix element of Hamiltonian

Ki, Kij, Kijkl...:

force constants

LCAO:

Linear Combination of Atomic Orbitals

MA :

mass of nucleus

MO:

Molecular Orbital

Σ:

group order

Q:

nuclear coordinate

r:

electron coordinate; radial (polar) coordinate; distance

\(\hat R\) :

resolvent

Sp(V):

trace of matrix V

t:

symmetry of vibration

T:

symmetry of electron state

\(\hat T\) :

Kinetic energy operator

U:

interaction potential

\(\hat V\) :

potential energy operator

\(\dot V,\ddot V,\dddot V\) :

derivatives of \(\hat V\) (first, second, third...)

X:

reduced matrix element

Xi, Xij, Xijk...:

electron-nuclear term of force constants; vibronic constant

Yj, m :

spherical harmonics with m and j quantum numbers

Z:

vibronic constant

γ:

component of irreducible representation Γ

Γ:

representation of symmetry

δij :

Kronecker delta

ε:

eigenvalue of matrix; vibronic correction term; component of E representation

ι:

angular coordinate; component of E representation

ϱ:

radial coordinate, Jahn-Teller radius

ϕ:

angular coordinate

φ:

electronic wave function

∇:

nabla operator

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Boča, R., Breza, M., Pelikán, P. (1989). Vibronic interactions in the stereochemistry of metal complexes. In: Stereochemistry and Bonding. Structure and Bonding, vol 71. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-50775-2_2

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  • DOI: https://doi.org/10.1007/3-540-50775-2_2

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