The crystal structure of tris(4-aminophenylthio)arsine,As(SC 6 H 4 -4-NH 2 ) 3

The reaction of a suspension of arsenic(III) oxide in deoxygenated methanol with redistilled 4-aminothiophenol at 25°C for 24 h afforded tris(4-aminophenylthio)arsine. Crystals suitable for X-ray analysis were obtained by recrystallization from chloroform. The compound is monoclinic [P2₁/n, 11.6427(2) Å, 9.3726(2) Å, 17.7788(4) Å, β = 99.854(2)°, Z = 4]. Its supramolecular organization is based on strong (N-H···N, N-H···S) and weak (C-H···S) intermolecular hydrogen bonding together with C-H···π interactions among the discrete molecular units. The crystal data of this and other As(III) trithiolates are compared and discussed in the light of probable operation of the α-effect in their nucleophilic reactions.