Hepta-tert-butylcyclotetrasilane: a highly crowded cyclotetrasilane

Autor:	Haruaki Sakurai, Hideyuki Matsumoto, Soichiro Kyushin
Rok vydání:	1995
Předmět:	Organic Chemistry chemistry.chemical_element Dihedral angle Ring (chemistry) Biochemistry Inorganic Chemistry Tetragonal crystal system Crystallography chemistry Crystal data Materials Chemistry Molecule Lithium Orthorhombic crystal system Physical and Theoretical Chemistry Absorption (chemistry)
Zdroj:	Journal of Organometallic Chemistry. 499:235-240
ISSN:	0022-328X
Popis:	The reaction of di-tert-butyldichlorosilane with lithium produced hepta-tert-butylcyclotetrasilane (1) and trans-1,1,2,3,3,4-hexa-tert-butylcyclotetrasilane (2). The structures of 1 and 2 were determined by X-ray crystallography. Crystal data for 1: orthorhombic, Cmcm, a = 12.071(1) A , b = 17.964(2) A , c = 18.292(1) A , V = 1534.6(2) A 3 , Z = 4, R, 0.067, R w = 0.051 for 1160 reflections. Crystal data for 2: tetragonal, P4 2 /m, a = 9.159(1) A , c = 18.292(1) A , V = 1534.6(2) A 3 , Z = 2, R = 0.047, R w = 0.056 for 768 reflections. Compound 1 is a highly crowded molecule which contains unusually long SiSi bonds (2.542(2) A) and a folded cyclotetrasilane ring with relatively small dihedral angles of 15.2° and 16.1°. In the UV spectrum of 1, absorption extends to the longer wavelength region than 2 and other alkyl-substituted cyclotetrasilanes so far reported. The oxidation potential of 1 (1.02 V vs. SCE) is significantly low compared with those of 2 and other less crowded cyclotetrasilanes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c2eeccc78d5075aabdf628361929ba99 https://doi.org/10.1016/0022-328x(95)00317-j Zobrazit plný text záznamu Full Text from ScienceDirect