title: A unique cobalt(II)-based molecular magnet constructed of hydroxyl/carboxylate bridges with a 3D pillared-layer motif.
abstract: A new pillared-layer coordination polymer, [Co(3)(pybz)(2)(pico)(2)](n) (1; pybz = 4-(pyridin-4-yl)benzoate, pico = 3-hydroxypicolinate), contains rare 2D [Co(3)(pico)(2)](n)(2n+) layers formed by linear cobalt(II) trimers through the unusual mu(4)-kappaN,O:kappaO'-mu(2):kappaO''-mu(2) bridging mode of pico ligands, which are further cross-pillared by exotridentate bridging pybz ligands to form a three-dimensional structure with an unusual uninodal 8-connected body-centered-cubic topology. The bulk magnetic behavior of 1 exhibits ferrimagnetic long-range ordering below 2.6 K, which mainly arises from the cooperative magnetic effect of the intra- and intertrimer arrangements in the 2D magnetic system based on the nature of the exchange modes of mu(2)-hydroxyl, mu(2)-carboxylate oxygen, and 1,1,3-mu(3)-carboxylate bridges.
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Northwest University, Xi'an 710069, People's Republic of China. zmh@mailbox.gxnu.edu.cn
authors.forename: Ming-Hua
authors.initials: MH
authors.lastname: Zeng
authors.forename: Yan-Ling
authors.initials: YL
authors.lastname: Zhou
authors.forename: Mei-Chun
authors.initials: MC
authors.lastname: Wu
authors.forename: Hao-Ling
authors.initials: HL
authors.lastname: Sun
authors.forename: Miao
authors.initials: M
authors.lastname: Du