Multi-functional architectures supported on organostannoxane scaffolds

Abstract

Organostannoxane cages and aggregates of well-defined composition and structure can be prepared by the reactions of organotin oxides or organotin oxide-hydroxides with protic acids. The utility of this strategy for the preparation of dendrimer-like molecules containing a stannoxane core and a functional periphery is described.

Preparation and characterization of Cp-functionalized cycloheptatrienyl–cyclopentadienyl titanium sandwich complexes (troticenes)

“…Compound 4 represents, to the best of our knowledge, the first example of a structurally characterized metallocene-supported organostannoxane in which the tin atoms are directly bound to the C n H nÀ1 ring. In contrast, organostannoxanes containing ferrocene units have been obtained from the reaction between ferrocenyl carboxylic acid and an organotin oxide or hydroxide, leading to C(O)O-bridged molecules [42,43]. Both tin atoms in 4 reside in a distorted tetrahedral environment with the angles ranging between 101.7(6) and 114.9(7) (at Sn1) and between 107.5(6) and 120.0(7) (at Sn2).…”

(3-Hydroxy-2-{[1-(2-oxidophenyl)ethylidene]amino-κ2O,N}propanoato-κO1)diphenyltin(IV)

“…For applications and biological activity of organotin compounds, see: Chandrasekhar et al (2008); Collinson & Fenton (1996). For related structures, see: Beltran et al (2003); Tian et al (2004).…”

“…Data collection: SMART (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL. Organotin compounds are of current interest due to their industrial, agricultural and biological applications (Chandrasekhar et al, 2008). Meanwhile, the chemistry of organotin(IV) complexes of Schiff bases has stemmed from the reported biocidal and anti-tumor activities of organotin(IV) complexes and the behavior of Schiff bases as models for biological systems (Collinson et al, 1996).…”