Structural diversity and variable temperature magnetic properties in copper dimethylmalonate coordination polymers containing dipyridyl-type coligands

Four copper dimethylmalonate (dmmal) phases containing long-spanning dipyridyl coligands have been prepared and structurally characterized by single-crystal X-ray diffraction. {[Cu-2(dmmal)(2)(edin)(H2O)(2)]center dot 3H(2)O}(n) (1, edin = N,N'-(ethane-1,2-diyl)diisonicotinamide) and {[Cu-2(dmmal)(2)(bdin)(H2O)(2)]center dot 2H(2)O}(n) (2, bdin = N,N'-(butane-1,4-diyl)diisonicotinamide) both show (6,3) herringbone layers constructed from the edin pillaring of [Cu(H2O)(dmmal)](n) chain motifs, that feature embedded equatorial-equatorial bridged (Cu(OCO)}(n) chains. [Cu-2(dmmal)(2)(bPmP)](n) (3, bpmp = bis(4-pyridylmethyl)piperazine) shows a decorated (4,4) grid topology built from bpmp pillared [Cu-2(dmmal)(2)](n) ribbon motifs, that feature embedded (Cu-2(OCO)(4)} paddlewheel dimeric units. [Cu-2(dmmal)(2)(bpfp)](n) (4, bpfp = bis(4-pyridylformyl)piperazine) shows a 5-connected non-interpenetrated 3D 4(4)6(6) sqp topology, formed from the bpfp pillaring of rectangular equatorial-equatorial bridged [Cu-2(dmmal)(2)](n) layers. Variable temperature magnetic studies were carried out on 1, 2 and 4, indicating predominant ferromagnetic superexchange within their equatorial-equatorial {Cu(OCO)}(n) chain motifs. (C) 2019 Elsevier Ltd. All rights reserved.