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Under thermal gradient in solution phase,the reaction of Hg(Ⅱ) and Cd(Ⅱ) salts with 2,3,5,6-tetrakis-(2-pyridyl)pyrazine(tppz) in 1:1 molar ratio afforded dinuclear[{HgI2}2(μ-tppz)](1) and mononuclear[CdI2(tppz)](2) complexes.Single-crystal X-ray diffract