Spin canting and/or metamagnetic behaviours of four isostructural grid-type coordination networks

Four isostructural, two-dimensional (2D) coordination polymers bridged by carboxylate groups, namely [Co(8-qoac)(HCOO)] (1 center dot Co), [Mn(8-qoac)(HCOO)] (1 center dot Mn), [Co(8-qoac)(CH3COO)] (2 center dot Co) and [Mn(8-qoac)(CH3COO)] (2 center dot Mn) (8-qoacH = quinoline-8-oxy-acetate acid), were constructed to study the modulation effects of spin carriers and interlayer interactions on the magnetic behaviours. The grid-type layers in these compounds are composed of octahedral metal ions bridged by carboxylate groups of 8-qoac ligands in the anti-anti fashion and formate/acetate in the syn-anti fashion, and these 2D layers are further packed into 3D structures through pi-pi stacking and hydrogen-bonding interactions. The Mn-II compounds show spin canting antiferromagnetic behaviours, while the Co-II compounds exhibit not only spin canting but also metamagnetic behaviours. Moreover, the critical fields of 1 center dot Co and 2 center dot Co are changed from 200 Oe to 6000 Oe for the stronger interlayer interaction with the second ligand changing from formate to acetate.