237747-32-9Relevant academic research and scientific papers
Synthesis, Nujol matrix and solution photochemistry of M(CO)2[η5,η3-C5H 4-C(CH3)2-C5H6] (where M=Cr or Mo): Molecular structures
Bitterwolf, Thomas E.,Saygh, Abdelhimed A.,Bays, J. Timothy,Weiss, Callie Ann,Scallorn, W. Bruce,Shade, Joyce E.,Rheingold, Arnold L.,Liable-Sands, Louise
, p. 152 - 161 (1999)
Reaction of chromium or molybdenum carbonyl with 2,2-bis(cyclopentadienyl)propane yields mixtures of products including M2(CO)6[η5,η5-C 5H4-C(CH3)2-C5H 4], M2(CO)6[η5-C5H 4-C(CH3)2-C5H4] 2, and the title compounds, M(CO)2[η5,η3-C5H 4-C(CH3)2-C5H6], in which an η3-pentenyl group is tethered to the η5-cyclopentadienyl (Cp) group by a 2,2-propyl linkage. Although several isomers are possible for the cyclopentenyl groups, chromium and molybdenum appear to form only single, but unique isomers. Photolysis of M(CO)2[η5,η3-C5H 4-C(CH3)2-C5H6], M=Cr or Mo, in Nujol glass at ca. 77 K has been found to be wavelength-dependent with low energy photolyses resulting in η3→η1 transformations while higher energy photolyses result in loss of carbon monoxide. Solution photolysis of the molybdenum derivative with triphenylphosphine yields as a first product Mo(CO)2[P(C6H5)3][η 5,η1-C5H4-C(CH3) 2-C5H6], which undergoes decomposition upon work-up to yield both starting material, and Mo(CO)[P(C6H5)3][η5,η 3-C5H4-C(CH3)2-C 5H6]. The molecular structures of three compounds have been determined: Mo(CO)2[η5,η3-C5H 4-C(CH3)2-C5H6]: monoclinic, P21/c, a=8.2767(4), b=19.875(1), c=7.960(1) A, β=96.720(6)°, V=1300.4(1) A3, Z=4, R(F)=2.82; Cr(CO)2[η5,η3-C5H 4-C(CH3)2-C5H6]: monoclinic, P21/c, a=9.960(1), b=9.1015(6), c=13.997(1) A, β=92.460(9)°, V=1267.7(2) A3, Z=4, R(F)=4.67; Mo(CO)[P(C6H5)3][η5,η 3-C5H4-C(CH3)2-C 5H6]: monoclinic, P21/c, a=7.939(1), b=22.381(3), c=15.050(2) A, β=103.55(1)°, V=2599.8(5) A3, Z=4, R(F)=4.01.
