From 1D Polymeric Chain to Two‐fold Parallel Interpenetration of (4,4) Net: Synthesis and Characterization of Two New Copper(II) Complexes Derived from Highly Polydentate Aminopolycarboxylate Ligand

Two new copper(II) polymers, {[Cu 2 (egta)(bpe)(H 2 O) 2 ]·H 2 O} n ( 1 ) and {[Cu 2 (egta)(bipy)(H 2 O) 2 ]·5H 2 O} n ( 2 ), [H 4 egta=3,12‐bis(carboxymethyl)‐6,9‐dioxa‐3,12‐diazatetradecanedioic acid, bpe=1,2‐bis(4‐pyridyl)ethane, bipy4,4′‐bipyridyl] have been synthesized and structurally characterized by single‐crystal X‐ray diffraction, elemental analysis, IR spectra and TG analysis. The structure determination reveals that both 1 and 2 crystallize in a monoclinic system, space group P 2 1 /c . Complex 1 exhibits a two‐fold parallel interpenetration of (4,4) net framework consisting of 1D zigzag chains interlocked together through hydrogen bonding interaction. However, the meso‐helix chains of 2 are packed to form 2D supramolecular structures. Interestingly, in 2 , the host frameworks encapsulate a unique pentamer water cluster and are further connected into 1D tapes by water‐water hydrogen bonding interaction. Magnetic measurements reveal that there is a weak ferromagnetic interaction between the adjacent Cu(II) ions in 1 .