Abstract
The crystal structure of the cyclic tetramer of formaldehyde, 1,3,5,7-tetroxocane, has been determined by the X-ray diffraction method. The unit cell is monoclinic, with a=11.455, b=4.160, c=12.232 A, and β=108.4°. The space group is C2/c, and there are four molecules per unit cell. The structure was solved by using a molecular transform method and was refined by the block-diagonal least-squares method to a final R factor of 0.051, using 728 reflections measured with an automated four-circle diffractometer. The molecules in the crystal are of the so-called crown form, with an approximate C4v symmetry but an exact C2 symmetry. The torsion angles about the four independent C–O bonds appear in two distinguishable values: two bonds with 83.7 and −83.6°, and the other two bonds with 93.6 and −94.1°. The average C–O bond length is 1.403 A, while the average C–O–C and O–C–O bond angles are 116.6 and 113.8° respectively. The deformation from a regular crown form by taking the two distinguishable torsion angles an...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
