Abstract
Oxidation of Os2(hpp)4Cl2, 1 (hpp = the anion of 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine), with (FeCp2)PF6 produces air-stable [Os2(hpp)4Cl2]PF6, 2. This is the first structurally confirmed metal - metal bonded paddlewheel compound having an M27+ core. The Os - Os distances for two crystalline forms, 2·2acetone and 2·hexane, are 2.3309(4) and 2.3290(6) Å, respectively. EPR, 1H NMR, and magnetization data indicate that 2 has an unpaired electron and an exceptionally low g value of 0.791 ± 0.037. An electrochemical study shows that there is a quasireversible wave corresponding to a more highly oxidized species with an unprecedented Os28+ core.
Original language | English |
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Pages (from-to) | 670-672 |
Number of pages | 3 |
Journal | Inorganic Chemistry |
Volume | 42 |
Issue number | 3 |
DOIs | |
State | Published - Feb 10 2003 |
Externally published | Yes |