| Popis: |
The hexameric n-butyloxotin benzoate, [n-BuSn(O)O2CC6H4NO2.2]6.3C6H6, 1, and the dimeric methyloxotin cyclohexanoate, [(MeSn(O)O2CC6H11)2MeSn(O2CC6H11)3]2, 4, were prepared by condensing the stannoic acid with the respective carboxylic acid. Reaction of n-butyltin. trichloride with the silver salt of the respective carboxylic acid gave the dimeric n-butyloxotin carboxylate compositions, [(n-BuSn(O)O2CR)2-n-BuSn(O2CR)3]2, 2 (R = Ph) and 3 (R = Me). These represent new substances and, as found by X-ray analysis, form a new structural class of organotin compounds for 2-4 having “unfolded drum” or “ladder” structures. The hexamer composition 1 exists in “drum” form. 119Sn NMR data show that the drum and ladder structures interconvert reversibly. 1 crystallizes in the rhombohedral/space group R3 with a H = 15.283 (4) A, cH, = 34.683 (9) A, and Z = 3. 2 crystallizes in the triclinic space group P1 with a = 13.657 (6) A, b = 14.104 (2) A, c = 14.559 (4) A, a = 99.14 (2)°, β = 111.73 (3)°, γ = 101.57 (3)... |
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