Add time:07/17/2019         Source:sciencedirect.com

A series of aryloxy organotin compounds Ph3Sn(CH2)3OC6H4R (5: R = H; 6: R = Ph; 7: R = OCH3, 8: R = CF3), Ph2ClSn(CH2)3OC6H4R (9: R = H; 10: R = Ph) and PhCl2Sn(CH2)3OC6H4R (12: R = H; 13: R = Ph) have been synthesized and characterised by NMR (1H, 13C, 119Sn) spectroscopy. X-ray structure determinations of 9, 10, 12 and 13 reveal a distorted trigonal bipyramidal geometry at Sn with Cl trans to the datively bonded O whereas 8 possesses tetrahedral geometry and a Sn⋯O dative interaction is absent. Triorganotin hydrides Ph2HSn(CH2)3OC6H4R (14: R = H; 15: R = Ph) and diorganotin dihydrides PhH2Sn(CH2)3OC6H4R (16: R = H; 17: R = Ph) were prepared by reduction of the corresponding dihalides with LiAlH4. Catalytic dehydrocoupling of dihydrides 16 or 17 with a late transition metal catalyst afforded asymmetrical hypercoordinated polystannanes [PhSn(CH2)3OC6H4R]n (18: R = H; 19: R = Ph) with relatively high molecular weights (Mw = 1.3 × 104 – 2.5 × 105 Da) and narrow polydispersities (PDI's = 1.3–3.3). NMR and UV–Vis spectroscopy studies indicate that the new polymers display dramatically improved light stability, but remain sensitive to moisture.

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