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The Hirshfeld surface of the Zn2+ center in (2), (3), (4), and (5) with a normalized contact distance (dnorm) mapped on it. The parameter dnorm ranges from −0.61 to 1.14 for Zn1 and from −0.62 to 1.12 for Zn2 (2); from −0.64 to 1.42 (3); from −0.62 to 1.26 (4), and from −0.59 to 0.90 (5).
