Crystal structure of an antiferromagnetically coupled µ-carbonato-bridged dinickel(II) complex containing the pendent-arm macrocycl 1-(3-dimethylaminopropyl)-1,5,9-triazacyclododecane (L1); a system which readily sequesters carbon dioxide from air

Abstract

The nickel(II) complex of the pendent-arm macrocycle 1-(3-dimethylaminopropyl)-1,5,9-triazacyclododecane (L¹) sequesters CO₂ from air to yield, after addition of thiocyanate ion, [{(HL¹)Ni(NCS)}₂(CO₃)]²⁺, the first example of a µ-carbonato dinickel(II) complex; the Ni atoms are antiferromagnetically coupled with the exceptionally large exchange constant –2J= 94.6 ± 0.4 cm^–1.