Organostannoxanes and Cyclophosphazenes as Scaffolds for Multi-Ferrocene Assemblies

• Published in: Phosphorus, sulfur, and silicon and the related elements sulfur, and silicon and the related elements, 2001-01, Vol.168 (1), p.227-231
• Main Authors: Chandrasekhar, Vadapalli, Nagendran, Selvarajan, Andavan, Gurusamy Thangavelu Senthil, Bansal, Sachin, Krishnan, Venkatasubbaiah
• Format: Article
• Language: English
• Subjects: cyclic voltammetry; cyclophosphazenes; drum; ferrocene; ladder; multi-metallocene; stannoxanes
• ISSN: 1042-6507; 1563-5325
• DOI: 10.1080/10426500108546558

The reactions of n-butylstannonic acid and di n-butyltinoxide with ferrocene monocarboxylic acid have been studied. In the former reaction a hexameric compound, [n-BuSn(O)OC(O)C 5 H 4 FeC 5 H 5 ] 6 has been isolated in a quantitative yield. In the latter reaction a tetrameric compound [{n-Bu 2 SnO 2 C(C 5 H 4 FeC 5 H 5 } 2 O}] 2 has been isolated. In contrast to the drum like structure of the former compound, the latter has a ladder like arrangement. Both [n-BuSn(O)OC(O)C 5 H 4 FeC 5 H 5 ] 6 and [{n-Bu 2 SnO 2 C(C 5 H 4 FeC 5 H 5 )} 2 O] 2 are electro-chemically robust and show a single oxidation peak in the cyclic voltammetric experiment corresponding to the simultaneous oxidation of six and four ferrocene substituents respectively. The hydrazine substituted cyclophosphazenes, N 3 P 3 [N(Me)NH 2 ] 6 , gem-N 3 P 3 Ph 2 [N(Me)NH 2 ] 4 , and gem-N 3 P 3 (O 2 C 12 H 8 ) 2 [N(Me)NH 2 ] 2 , are readily condensed with ferrocene carboxaldehyde, C 5 H 5 FeC 5 H 4 CHO, to afford the corresponding cyclophosphazenes linked to the ferrocenyl moiety through the hydrazone linkage, N 3 P 3 [N(Me)N=CHC 5 H 4 FeC 5 H 5 ] 6 , gem-N 3 P 3 Ph 2 [N(Me)N=CHC 5 H 4 FeC 5 H 5 ] 4 , and gem-N 3 P 3 (O 2 C 12 H 8 ) 2 ]N(Me)N=CHC 5 H 4 FeC 5 H 5 ] 2 .