Sulflower

Sulflower
Ball-and-stick model	Space-filling model
Names
	Systematic IUPAC name 1,12:3,4:6,7:9,10-Tetraepithiocycloocta[1,2-c:3,4-c':5,6-c:7,8-c']tetrathiophene
	Other names Octathio[8]circulene
Identifiers
CAS Number	921210-36-8;
3D model (JSmol)	Interactive image;
ChemSpider	21267678;
PubChem CID	101427667;
CompTox Dashboard (EPA)	DTXSID00891950;
	InChI InChI=1S/C16S8/c17-9-1-2-4-6-8-7-5-3(1)11(18-9)20-13(5)22-15(7)24-16(8)23-14(6)21-12(4)19-10(2)17 Key: SNTHAZVSUIFTDO-UHFFFAOYSA-N;
	SMILES c12c3c4c5c6c7c8c1c9sc2sc3sc4sc5sc6sc7sc8s9;
Properties
Chemical formula	C16S8
Molar mass	448.66 g·mol−1
Appearance	Dark red powder
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Sulflower (a portmanteau of sulfur and sunflower) is a stable heterocyclic octacirculene based on thiophene. Sulflower does not contain any hydrogen. With molecular formula (C₂S)₈ the compound is considered a type of carbon sulfide. The molecule is flat and together with the 9-membered homolog is at a local strain energy minimum.[1]

Crystal structure

Stacking of sulflower molecules in the crystal structure	Packing of sulflower molecules in the crystal structure

Its synthesis (a variation of the Ferrario reaction) is based on deprotonation of a tetrathiophene with lithium diisopropylamide followed by reaction with elemental sulfur to a sulfur-substituted intermediate followed by vacuum pyrolysis.

Sulflower synthesis

The sulflower molecule has a planar structure with D_8h symmetry, i.e., all eight sulfur atoms as well as the two faces of the molecule are undistinguishable. Because of its planar structure, it is predicted to be able to store many hydrogen molecules between the stacks. The conformation of the H₂ molecule is calculated to be "standing up" over the five membered rings. Detailed DFT calculations have been performed on these molecules.[2]

References

Konstantin, Yu. Chernichenko; Sumerin, Viktor V.; Shpanchenko, Roman V.; Balenkova, Elizabeth S.; Nenajdenko, Valentine G. (2006). "Sulflower: A New Form of Carbon Sulfide". Angewandte Chemie International Edition. 45 (44): 7367–7370. doi:10.1002/anie.200602190.
Datta, Ayan; Pati, Swapan K. (2007). "Computational design of high hydrogen adsorption efficiency in molecular "Sulflower"". J. Phys. Chem. C. 111: 4487. doi:10.1021/jp070609n.

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[1] Konstantin, Yu. Chernichenko; Sumerin, Viktor V.; Shpanchenko, Roman V.; Balenkova, Elizabeth S.; Nenajdenko, Valentine G. (2006). "Sulflower: A New Form of Carbon Sulfide". Angewandte Chemie International Edition. 45 (44): 7367–7370. doi:10.1002/anie.200602190.

[2] Datta, Ayan; Pati, Swapan K. (2007). "Computational design of high hydrogen adsorption efficiency in molecular "Sulflower"". J. Phys. Chem. C. 111: 4487. doi:10.1021/jp070609n.