Synthesis of Tetrakis(2, 6-di-Isopropylphenylisocyanide)bis(Per-Chlorato)Cobalt(II) and Hexakis(2, 6-di-Isopropylphenylisocyanide)-Cobalt(II) Tetrafluoroborate. An Example of Dissimilarity Between Perchlorate and Tetrafluoroborate Salts

Abstract

Reaction of 2, 6-(CHMe₂)₂ C₆H₃NC in 5:1 mole ratio with Co(II) produces transient Co(CNR)₅X₂ nH₂o, × = Clo₄, BF₄. The perchlorate salt sponlaneously transforms into [Co (CNR) ₄ (ClO₄) ₂] and the tetrafluoroborate salt into [Co (CNR) ₆] (BF₄) ₂. Perchlorate-ion coordination is confirmed by analogy with [Co(CNR) ₄ (Clo₄)]₄, R = 2, 6-Me₂C₆H₃, 2, 6-Et₂C₆H₃. The BF₄ ⁻ salt is the first known example of a hexakis (organoisocyanide)-cobalt(II) complex to be isolated, and shows deviation from octahedral coordination in solid state.