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An analysis of disorder in [(eta(5)-C5H4SiMe3)Re(CO)(2)NO](+), [(eta(5)-C5H4Me)Re(CO)(2)(NO)](+), and related compounds
Stowell, GW., Whittle, RR., Whaley, CM., & White, DP. (2001). Understanding Re-NO bond distances: An analysis of disorder in [(eta(5)-C5H4SiMe3)Re(CO)(2)NO](+), [(eta(5)-C5H4Me)Re(CO)(2)(NO)](+), and related compounds. Organometallics, 20(6), 1050-1052. https://doi.org/10.1021/om0005654
Apparently elongated Re-NO and shortened Re-CO bonds in the new completes {(n(5)-C5H4R)Re(CO)(2)-NO]BF4 (R = SiMe3, Me) can be understood in terms of random positional disorder in the unit cell. We report a thorough crystallographic analysis of similar compounds in the literature and find many instances with erroneous Re-NO and Re-CO bond lengths due to unrecognized or unreported disorder. Positional disorder is noted for achiral substituted cyclopentadienyl complexes of rhenium, whereas crystallographic packing disorder is noted for the chiral complexes.