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Four copper(II) complexes and one copper(I) complex with pyridine-containing pyridylalkylamide ligands N-(pyridin-2-ylmethyl)pyrazine-2-carboxamide (HLpz) and N-(2-(pyridin-2-yl)ethyl)pyrazine-2-carboxamide (HLpzʹ) were synthesized and characterized. The X-ray crystal structures of [Cu2(Lpz)2(4,4ʹ-bipy)(OTf)2] (1, OTf = trifluoromethanesulfonate, 4,4ʹ-bipy = 4,4ʹ-bipyridine) and [Cu(Lpz)(py)2]OTf·H2O (2, py = pyridine) revealed binuclear and mononuclear molecular species, respectively, while [Cu(Lpz)(μ2-1,1-N3)]n (3), [Cu(Lpzʹ)(μ2-1,3-N3)]n (4), and [Cu(HLpz)Cl]n (5) are coordination polymer 1-D chains in the solid state.
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Houser et al. (2013) studied this question.
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