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Issue 13, 2014
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Switchable NLO response induced by rotation of metallacarboranes [NiIII/IV(C2B9H11)2]−/0 and C-,B-functionalized derivatives

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Abstract

The rotary motion based on metallacarboranes around a molecular axis can be controlled by simple electron transfer processes, which provides a basis for the structure–property relationship for the nonlinear optical (NLO) switching. However, this phenomenon has not been previously reported in the development of NLO properties of metallacarboranes. In this work, the metallacarboranes [NiIII/IV(C2B9H11)2]−/0 and their C-,B-functionalized derivatives are studied by the density functional theory (DFT) method. By calculating relative energies, we obtained the stable states before and after rotation controlled by simple electron transfer. Then, the static and frequency-dependent second-order NLO properties were calculated by several DFT functionals. According to the TDDFT results, the large NLO responses of the studied compounds are mainly caused by substituent group-to-carborane cage charge transfer (L′LCT) and substituent group-to-metal charge transfer (L′MCT) processes. The order of first hyperpolarizabilities (β values) illustrates that the NLO response can be enhanced by introducing a strong electron-donating group. Significantly, the geometric interconversions resulting from the redox reaction of 1C/1T6C/6T allow the NLO responses to be switched “ON” or “OFF”. The B(9,9′)-methoxyphenyl-functionalized derivative of nickelacarborane, having low energetic cost and large different NLO responses between two states (from 0 to 20 998 a.u.), can be an excellent switchable NLO material.

Graphical abstract: Switchable NLO response induced by rotation of metallacarboranes [NiIII/IV(C2B9H11)2]−/0 and C-,B-functionalized derivatives

  • This article is part of the themed collection: Carboranes
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Publication details

The article was received on 22 Nov 2013, accepted on 12 Dec 2013 and first published on 13 Dec 2013


Article type: Paper
DOI: 10.1039/C3DT53298D
Citation: Dalton Trans., 2014,43, 5069-5075
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    Switchable NLO response induced by rotation of metallacarboranes [NiIII/IV(C2B9H11)2]−/0 and C-,B-functionalized derivatives

    N. Ma, S. Li, L. Yan, Y. Qiu and Z. Su, Dalton Trans., 2014, 43, 5069
    DOI: 10.1039/C3DT53298D

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