Synthesis and Structures of Silver(I) Adducts with 4-Amino-3,5-diisobutyl-4H-1,2,4-triazole: The Identification of a New Type of Ag₃tz₆ Cluster

Reactions of silver(I) salts with 4-amino-3,5-diisobutyl-4H-1,2,4-triazole (4-NH₂-3,5-ⁱBu₂-tz) or 4-amino-3,5-dibutyl-4H-1,2,4-triazole (4-NH₂-3,5-Bu₂-tz) yielded five new adducts, namely, [Ag₂(4-NH₂-3,5-ⁱBu₂-tz)₂(NO₃)₂] (1), [Ag₃(4-NH₂-3,5-ⁱBu₂-tz)₆](SO₃CF₃)₃ (2), [Ag₃(4-NH₂-3,5-ⁱBu₂-tz)₆](ClO₄)₃ (3), [Ag₄(4-NH₂-3,5-Bu₂-tz)₆](ClO₄)₄ (4) and [Ag₄(4-NH₂-3,5-Bu₂-tz)₆](CF₃SO₃)₄ (5). X-ray analyses have been done on the first four adducts, showing that 1 and 4 adopt previously observed Ag₂tz₂ and Ag₄tz₆-a cluster structures, respectively; 2 and 3, on the other hand, contain an unprecedented Ag₃tz₆ cluster, which is closely related to Ag₄tz₆-a cluster by removal of one Ag atom from the latter. The formation of Ag₃tz₆ cluster other than the expected Ag₄tz₆ cluster in 2 and 3 has been tentatively attributed to the steric effect of isobutyl groups.