Synthesis, crystal and molecular structure of η 3-allylundecacarbonylosmium tetrafluoroborate

Abstract

The η 3-allylundecacarbonylosmium tetrafluoroborate has been synthesized in high yield by treatment of Os 3(CO) 11MeCN with allyl alcohol and subsequent protonation. It has been studied by single-crystal X-ray diffraction. The compound crystallizes in the orthorhombic space group Pna2 1 (no. 33) with a 17.933(2), b 11.440(2), c 11.797(2)Å and D c 2.76 g cm −3 for Z = 4. A final R value of 0.046 ( R w = 0.083) based on 2067 reflections was obtained. The presence of the positively charged allyl ligand in the triosmium cluster lengthens the Os1Os2 and Os2Os3 bonds (0.057Å) and 0.074 Å, respectively) relative to the OsOs bonds in Os 3(CO) 12.