Abstract

AbstractHydrothermal reaction of the requisite metal nitrate, carboxycinnamic acid (H2cca), and the long‐spanning dipyridylamide bis(4‐pyridylformyl)piperazine (4‐bpfp) generate crystalline coordination polymers whose topology depends critically on the metal coordination geometric preference. These two new phases were structurally characterized by single‐crystal X‐ray diffraction. {[Cu(cca)(4‐bpfp)]·2.5H2O}n (1) manifests a non‐interpenetrated 6‐connected pcu net based on chain motifs featuring carboxylate‐bridged {Cu2(OCO)2} dinuclear units, with embedded D(5) water molecule chains. {[Ni(cca)(4‐bpfp)(H2O)2]·3H2O}n (2) displays an acentric twofold interpenetrated 4‐connected 66 dia network topology with entrapped R(4)A(1) water molecule rings. Variable temperature magnetic studies performed on 1 revealed very weak antiferromagnetic coupling within its dinuclear units. Thermal properties of these two new materials are also discussed.

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