Weak Sn center dot center dot center dot I interactions in the crystal structures of the iodostannates [SnI4](2-) and [SnI3](-) [German]

摘要

Iodostannate complexes can be crystallized from SnI2 solutions in polar organic solvents by precipitation with large counterions. Thereby isolated anions as well as one, two or three-dimensional polymeric anionic substructures are established, in which SnI3- and SnI42- groups are linked by weak Sn I interactions. Examples are the iodostannates [Me3N-(CH2)(2)-NMe3][SnI4] (1), (Ph4P)(2)[Sn2I6] (2), [Me3N-(CH2)(2)-NMe3][Sn2I6] (3). [Fe(dmf)(6)] [SnI3](2) (4) and (Pr4N)[SnI3] (5), which have been characterized by single crystal X-ray diffraction. [Me3N-(CH2)(2)-NMe3][SnI4] (1): a = 671.6(2), b = 1373.3(4), c = 2046.6(9) pm, V = 1887.7(11).10(6) pm(3), space group Pbcm; (Ph4P)(2)[Sn2I6] (2): a = 1168.05(6), b = 717.06(4), c = 3093.40(10) pm. beta = 101.202(4)degrees, V = 2541.6(2).10(6) pm(3), space group P2(1); [Me3N-(CH2)(2)-NMe3][Sn2I6] (3). a = 695.58(4), b = 1748.30(8), c = 987.12(5) pm, beta = 92.789(6)degrees, V = 1199.00(11).10(6) pm(3), space group P2(1)/c; [Fe(dmf)(6)][SnI3](2) (4): a = 884.99(8), b = 1019.04(8), c = 1218.20(8)pm, alpha = 92.715(7), beta = 105.826(7), gamma = 98.241(7), V = 1041.7(1).10(6) pm(3), space group P (1) over bar; (Pr4N)[SnI3] (5). a = 912.6(2), b =1205.1(2), c = 1885.4(3) pm, V = 2073.5(7).10(6) pm(3), space group P2(1)2(1)2(1). [References: 22]