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

Abstract 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)(H 2 O) 2 ]·3H 2 O} n ( 1 , edin = N , N ′-(ethane-1,2-diyl)diisonnicotinamide) and {[Cu 2 (dmmal) 2 (bdin)(H 2 O) 2 ]·2H 2 O} n ( 2 , bdin = N , N ′-(butane-1,4-diyl)diisonnicotinamide) both show (6,3) herringbone layers constructed from the edin pillaring of [Cu(H 2 O)(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.