Novel Mixed Complexes of Copper(II) and Ethylenediamine: Synthesis, Crystal Structure, and Catalytic Activity in the Cross-Coupling Reaction of 1-Phenyl-5 H -tetrazole-5-thiol and Iodobenzene

Two earlier unknown complexes, [Cu(en) 2 (Hptt)]Br (Hptt = 1-phenyl-1H-terazole-5-thiol, en = ethylenediamine) and trans -[Cu(en)2(H2O)Br]Br, have been synthesized and characterized using X-ray diffraction analysis. In [Cu(en) 2 (Hptt)]Br complex, the copper cation is bonded with the N 4 atom of tetrazole ring. Catalytic activity of the obtained complexes in cross-coupling reaction of 1-phenyl-5H-tetrazole-5-thiol with iodobenzene is comparable to that of CuBr 2 in the presence of 2 eq. of ethylenediamine.