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A windmill-like trititanium cluster with side-on-bonded CO ligands (see picture), which may have antiaromatic character, was revealed by FTIR spectroscopy and DFT calculations. It is generated, along with other side-on-bonded mono- and polycarbonyl di- and trititanium clusters, in the reaction of laser-ablated Ti atoms with CO in a solid argon matrix.
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Xü et al. (2005) studied this question.
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