Abstract
The indirect (through-bridge) components of chemical interactions between atomic orbitals (AO) are shown to originate from the indirect dependencies between AO due to the orbital intermediaries in the bond system of the molecule. They are expressed in terms of the bridge-coupling elements of the density matrix via the chain rule transformation of the implicit derivatives between the indirectly bonded AO in the molecular bond system. The elements of the charge-and-bond-order (CBO) matrix are interpreted as the canonical derivatives between the AO-projections onto the bond subspace combining the occupied Molecular Orbitals (MO). The chain-rule manipulations are then used to express the scattering amplitudes via AO intermediaries in terms of the relevant elements of the CBO matrix. The squares of such amplitudes are related to the Wiberg-type indirect bond components, which complement the familiar direct Wiberg bond-order contributions. The interference implications of the probability scatterings via the multiple cascades involving all basis functions are examined. These probability propagations are shown to preserve the stationary conditional probabilities of the underlying molecular communication channel in AO resolution.
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Throughout the paper A denotes a scalar quantity, A stands for a row-vector, and A represents a square or rectangular matrix.
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Nalewajski, R.F., Gurdek, P. On the implicit bond-dependency origins of bridge interactions. J Math Chem 49, 1226–1237 (2011). https://doi.org/10.1007/s10910-011-9815-6
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DOI: https://doi.org/10.1007/s10910-011-9815-6