Multi-electron reactivity of a cofacial di-tin(ii) cryptand: partial reduction of sulfur and selenium and reversible generation of S3˙.
نویسندگان
چکیده
Cofacial bimetallic tin(ii) ([Sn2(mBDCA-5t)]2-, 1) and lead(ii) ([Pb2(mBDCA-5t)]2-, 2) complexes have been prepared by hexadeprotonation of hexacarboxamide cryptand mBDCA-5t-H6 together with double Sn(ii) or Pb(ii) insertion. Reaction of 1 with elemental sulfur or selenium generates di-tin polychalcogenide complexes containing μ-E and bridging μ-E5 ligands where E = S or Se, and the Sn(ii) centers have both been oxidized to Sn(iv). Solution and solid-state UV-Vis spectra of [(μ-S5)Sn2(μ-S)(mBDCA-5t)]2- (4) indicate that the complex acts reversibly as a source of S3˙- in DMF solution with a Keq = 0.012 ± 0.002. Reductive removal of all six chalcogen atoms is achieved through treatment of [(μ-E5)Sn2(μ-E)(mBDCA-5t)]2- with PR3 (R = t Bu, Ph, OiPr) to produce six equiv. of the corresponding EPR3 compound with regeneration of di-tin(ii) cryptand complex 1.
منابع مشابه
Multi-electron reactivity of a cofacial di-tin(ii) cryptand: partial reduction of sulfur and selenium and reversible generation of S3˙– † †Electronic supplementary information (ESI) available: Experimental procedures and crystallographic details. CCDC 1469593, 1469595 and 1469596. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c6sc01754a Click here for additional data file. Click here for additional data file.
Department of Chemistry, Massachusetts I Avenue, Cambridge, MA, 02139-4307, USA. Department of Chemistry and Chemical Street, Cambridge, MA 02138-2902, USA. EDepartment of Chemistry, Queen's Univer Canada K7L 3N6. E-mail: [email protected] † Electronic supplementary information ( and crystallographic details. CCDC 14695 crystallographic data in CIF or o 10.1039/c6sc01754a Cite this: Chem. Sci., 20...
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ورودعنوان ژورنال:
- Chemical science
دوره 7 12 شماره
صفحات -
تاریخ انتشار 2016