Organometallic Rhodium(III) and -(I) Complexes with 1,3-Diniethyllumazine(DML). The Crystal Structure of [(η 2 - (O 4 ,N 5 )DML)(η 5 -C 5 Me 5 )ClRh](PF 6 )
The crystal structure determination of the new rhodium(III)-complex [(DML)(C 5 Me 5 )ClRh](PF 6 ). DML = 1,3-dimethyllumazine, reveals O 4 ,N 5 coordination of the metal to DML with not very different bond lengths of 213.0(2) pm (Rh-N) and 219.2(2) pm (Rh-O). This result stands in contrast to the pr...
| Published in: | Zeitschrift für Naturforschung B |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Walter de Gruyter GmbH
1994
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1515/znb-1994-1117 https://www.degruyter.com/view/journals/znb/49/11/article-p1554.xml https://www.degruyter.com/document/doi/10.1515/znb-1994-1117/xml https://www.degruyter.com/document/doi/10.1515/znb-1994-1117/pdf |
| Summary: | The crystal structure determination of the new rhodium(III)-complex [(DML)(C 5 Me 5 )ClRh](PF 6 ). DML = 1,3-dimethyllumazine, reveals O 4 ,N 5 coordination of the metal to DML with not very different bond lengths of 213.0(2) pm (Rh-N) and 219.2(2) pm (Rh-O). This result stands in contrast to the previously reported structure of a cationic dihydrobiopterin bound to [Mo(O)Cl 3 ] - which exhibited a very unsymmetrical chelate arrangement. Chemical and electrochemical two-electron reduction of the Rh(III) complex led to a very labile Rh(I) species (DML)(C 5 Me 5 )Rh which is distinguished by an intense charge transfer band in the visible. The results confirm the characterization of DML as a weak σ donor/π acceptor ligand with a rather low-lying π* orbital. |
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