Lewis-base adducts of Group 1 metal(I) compounds. III. Synthesis and crystal structures of the 1 : 1 adducts of silver(I) iodide with triethylamine, 2- and 3-methylpyridine and quinoline

Abstract

The crystal structures of the title compounds have been determined at 295(1) K by single-crystal X-ray diffraction methods. For [AgI(Et₃N)] (1), the unit cell is tetragonal, P4₂/nmc, a 13.202(6),c 11.654(8) Å; the structure was refined to a residual of 0.077 for 589 independent 'observed' reflections, and is isostructural with the 'pseudo-cubane' triethylphosphine and triethylarsineanalogues with two tetrameric units in the cell. For [AgI(2-MeC₅H₄N)] (2), the cell is orthorhombic,P2₁2₁2₁, a 16.63(1), b 10.797(9), c 4.570(4) Å, Z 4; a residual of 0.030 was obtained for 770 independent 'observed' reflections. For [AgI(3-MeC₅H₄N)] (3), the cell is monoclinic, P2₁/n, a 19.57(2), b 4.633(3), c 9.355(7) Å, β 90.85(7)º, Z 4, a residual of 0.038 being obtained for 1382 independent 'observed' reflections. For [AgI(C₉H₇N)](4), the unit cell is monoclinic, P2₁/n, a 12.964(9), b 16.84(2), c 4.454(4) Å, β 97.10(7)º, Z 4, a residual of 0.040 being obtained for 660 'observed' independent reflections. For compounds (2)-(4), the observed structures are all 'stairpolymers'; the structures of (2) and (3) are quite similar, but that of (4) exhibits significant differences.