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Refinements of the crystal structures of 1,4-diphenylbutadiyne and its complex with two moles of Co2(CO)6

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Abstract

1,4-diphenylbutadiyne, C16H10, crystallizes in monoclinic space group P21/n witha=6.6152(6),b=6.0768(7),c=14.634(1) Å, β=100.981(8)0,V=577.5(2) Å3,Z=2. The structure was refined toR=0.077 andR w=0.069 for 1007 observed reflections with CuKα radiation. The molecule lies on an inversion center. Our determination represents and increase in precision of a factor of approximately three over the original determination. The 2∶1 cobalt complex, C16H10[Co2(CO)6]2, also crystallizes in monoclinic space group P21/n witha=8.9568(12),b=17.7057(10),c=18.5671(12) Å, β=90.606(12)o,V=2944.3(5) Å3,Z=4. The structure was refined toR=0.032 andR w=0.031 for 4312 observed reflections. The diphenylbutadiyne triple bonds elongate to 1.346(3) Å and the angles at the diyne C atoms decrease to 134.1(3)–144.9(3)o upon complexation. The Co-Co distance is 2.4580(4)Å. Our data represent an increase in precision by a factor of 2–3 over the original determination.

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Fronczek, F.R., Erickson, M.S. Refinements of the crystal structures of 1,4-diphenylbutadiyne and its complex with two moles of Co2(CO)6 . J Chem Crystallogr 25, 737–742 (1995). https://doi.org/10.1007/BF01670327

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