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Diradical character of neutral heteroleptic bis(1,2-dithiolene) metal complexes: case study of [Pd(Me2timdt)(mnt)] (Me2timdt = 1,3-dimethyl-2,4,5-trithioxoimidazolidine; mnt2– = 1,2-dicyano-1,2-ethylenedithiolate)

Research output: Contribution to journalArticlepeer-review

Open Access Status

  • Embargoed (until 13/11/21)

Author(s)

M. Carla Aragoni, Claudia Caltagirone, Vito Lippolis, Enrico Podda, Alexandra Martha Zoya Slawin, J Derek Woollins, Anna Pintus, Massimiliano Arca

School/Research organisations

Abstract

The reaction of the bis(1,2-ditiolene) complex [Pd(Me2timdt)2] (1; Me2timdt•– = monoreduced 1,3-dimethyl-2,4,5-trithioxoimidazolidine) with Br2 yielded the complex [Pd(Me2timdt)Br2] (2), which was reacted with Na2mnt (mnt2– = 1,2-dicyano-1,2-ethylenedithiolate) to give the neutral mixed-ligand complex [Pd(Me2timdt)(mnt)] (3). Complex 3 shows an intense solvatochromic near-infrared (NIR) absorption band falling between 955 nm in DMF and 1060 nm in CHCl3 (ε = 10700 M–1 cm–1 in CHCl3). DFT calculations were used to elucidate the electronic structure of complex 3, and to compare it with those of the corresponding homoleptic complexes 1 and [Pd(mnt)2] (4). An in-depth comparison of calculated and experimental structural and vis–NIR spectroscopic properties, supported by IEF-PCM TDDFT and NBO calculations, clearly points to a description of 3 as a dithione-dithiolato complex. For the first time, a Broken-Symmetry (BS) procedure for the evaluation of the singlet diradical character (DC) of heteroleptic bis(1,2-dithiolene) complexes has been developed and applied to complex 3. The DC, predominant for 1 (nDC = 55.4%), provides a remarkable contribution to the electronic structures of the ground states of both 3 and 4, showing a diradicaloid nature (nDC = 24.9% and 27.5%, respectively). The computational approach developed here clearly shows that a rational design of the DC of bis(1,2-ditiolene) metal complexes, and hence their linear and nonlinear optical properties, can be achieved by a proper choice of the 1,2-dithiolene ligands based on their electronic structure.
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Details

Original languageEnglish
JournalInorganic Chemistry
VolumeArticles ASAP
Early online date13 Nov 2020
DOIs
Publication statusE-pub ahead of print - 13 Nov 2020

    Research areas

  • 1,2-dithiolene, Palladium, DFT, Push-pull, Broken symmetry, NLO

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