An organo-functionalized metal–oxide cluster, [VIV6O6{(OCH2CH2)2N(CH2CH2OH)}6], with Anderson-like structure
| Autor: | Hanbo Li, Robert J. Doedens, M. I. Khan, LaSalle Swenson |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Dalton Transactions. 45:16511-16518 |
| ISSN: | 1477-9234 1477-9226 |
| DOI: | 10.1039/c6dt03354g |
| Popis: | A new polyoxovanadium cluster compound, [VIV6O6{(OCH2CH2)2N(CH2CH2OH)}6]·0.5CH3CN, was synthesized and characterized by single-crystal X-ray diffraction analysis, FTIR and UV-vis spectroscopy, and TGA. The cluster is composed of a fully reduced cyclic {V6N6O18} framework, which adopts an Anderson-like structure and is comprised of a ring of six edge-sharing {VO5N} octahedra incorporating six {(OCH2CH2)2N(CH2CH2OH)} ligands. Two (OCH2CH2–) arms of each of the six triethanolamine ligands are directly incorporated into the oxometalate core and the third {–CH2CH2OH} arm remains pendant. In the condensed phase, the clusters form discrete hcp layers through inter-cluster hydrogen bonding. These layers stack through soft chemical interactions to form a 3D network structure. The neutral cluster, [VIV6O6{(OCH2CH2)2N(CH2CH2OH)}6], is the isopolyoxovanadium analogue to the cationic clusters contained in a series of heteropolyoxovanadium compounds previously introduced by our laboratory, e.g., [LiVIV6O6{(OCH2CH2)2N(CH2CH2OH)}6]+; its existence shows that a heteroatom is not required to form or stabilize the common organofunctionalized vanadium oxide framework: [VIV6O6{(OCH2CH2)2N(CH2CH2OH)}6]. To the best of our knowledge, the isopolyoxovanadium and heteropolyoxovanadium clusters represent the first reported isopoly–heteropoly analogues in the polyoxometalate field. We compare the TGA profile, FTIR and UV-vis spectra of the new compound with two of its cationic heteropoly analogues. |
| Databáze: | OpenAIRE |
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