Siderophore, III. Neutrale Koordinationspolymere aus Pyrrolinyl‐enolen und Kupfer(II)1‐acetat durch spontane Selbstorganisation – Kristallstruktur von 2D‐[CuL22]n

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Abstract
Siderophores, III[1]. – Neutral Coordination Polymers from Pyrrolinyl Enols and Copper(II) Acetate by Spontaneous Self‐Assembly – Crystal Structure of 2D‐[CuL22]nContrary to tetrazole 1 (HL1) structurally analogous pyrrolidines 3 (HL2) react with copper(II) acetate to give 2D‐coordination polymers 4 ([CuL22]n), rather than 3D‐coordination polymer 2 ([CuL21]n). The structure of 4a is established by single‐crystal X‐ray diffraction. The formation of 2D‐coordination polymer 4a is understandable if 3a or its enolate is considered as tridentate chelate ligand and if an intermediate formation of the coordinatively unsaturated copper(II) building block 5a is assumed. The monomers 5a are bidentate coordinating with the two CN groups, which leads to linking of monomers and to coordinative saturation at the copper(II) center of 5a with formation of 2D‐4a. Depolymerisation of 2D‐4 with excess pyridine leads to racemic mononuclear tetragonally pyramidally coordinated copper(II) chelate complexes 6 (X‐ray), whereas under the same conditions 3D‐2 yields octahedral bis(pyridine) complex CuL21(Py)2.

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