N-adamant-1-yl-N'-(2-iodophenyl)guanidinium chloride

N-(2-Iodophenyl)-N'-(tricyclo[3.3.1.1(3,7)]-decan-1-yl) guanid inium chloride, C17H23ClIN3, Mr = 431.75, monoclinic, P2(1)/c, a = 11.696 (5), b = 20.120 (4), c = 7.754 (2) A, beta = 95.26 (3) degrees, V = 1817 (1) A3, Z = 4, Dx = 1.578 Mg m-3, lambda (Mo K alpha) = 0.71069 A, mu = 1.89 mm-1, F(000) = 864, T = 295 K, R = 0.071 for 1169 observed [I greater than or equal to 3 sigma(I)] reflections. Both the phenyl and the adamantyl groups lie syn to the unsubstituted nitrogen of the guanidinium ion. The plane of the phenyl ring is nearly perpendicular to that of the guanidinium group.