ABSTRACT
Chlorotris(2,4,6-trimethylphenyl)tin(IV), crystallizes from ethanol as solvent-free needles, [Sn(C(9)H(11))(3)Cl], (I), and as the hemisolvate, [Sn(C(9)H(11))(3)Cl].0.5C(2)H(6)O, (II). The asymmetric unit in (I) has three independent molecules, whereas in (II), there are two [Sn(C(9)H(11))(3)Cl] molecules together with one ethanol molecule. In the unit cell of (II), the ethanol molecules lie in channels between stacks of (Mes)(3)SnCl molecules (Mes is 2,4,6-trimethylphenyl) and each ethanol molecule is disordered (0.50:0.50) over two positions. A comparison of the structures of the title compounds and other (Mes)(3)SnX (X = F, Br or I) systems with those of the triphenyltin analogues shows that the steric requirements of the o-CH(3) groups are met by a flattening of the SnC(3) skeleton and increases in the average Sn-X and Sn-C values. Comparing Sn-X data for (Mes)(3)SnX (X = F, Cl, Br or I) systems with values for the tris(o-methoxyphenyl)tin analogues suggests that the Sn-F distance of 1.961 A in (Mes)(3)SnF may well be characteristic of sterically unhindered four-coordinate Ar(3)SnF systems.
ABSTRACT
The title compound, [MnSn(C(7)H(7)O(2)S)(3)(CO)(5)], is asymmetric but crystallizes in the highly symmetric tetragonal space group I-4. This is achieved without the need for any disorder, either around the Sn atom or in any of the methylsulfonyl groups. The environment around the Sn atom has the following geometry: Sn-Mn = 2.6564 (7) A, mean Sn-C = 2.175 (5) A, mean C-Sn-C = 103 (2) degrees and mean C-Sn-Mn = 115 (6) degrees. The crystal packing is assisted by weak Sn.O interactions between adjacent columns of molecules, with the resulting geometry at Sn approaching highly distorted trigonal-bipyramidal.
