Concave reagents part 33: transition metal complexes of 1,10-phenanthroline bridged calix[6]arenes†
Abstract
1,10-Phenanthroline bridged calix[6]arenes 1a and 1b have been synthesized and metal salt complexes with Cu+, Cu2+, Co2+, Ni2+ and Eu3+ have been isolated. In contrast to the concave 1,10-phenanthrolines 2, which only form 1:1 complexes with metal salts, 1 also forms 2:1 complexes with Cu2+, Co2+ and Ni2+. Only Cu+ forms 1:1 complexes exclusively.