Structural and magnetic properties of four layered dicyanamide-based coordination polymers: M{N(CN)(2)}(2)(DMSO)(2), [M = Mn, Fe, Co, Ni]

作者：Rajan Divya; Quintero Pedro A; Abboud Khalil A; Meisel Mark W; Talham Daniel R^*

来源：Polyhedron, 2013, 66: 142-146.

DOI：10.1016/j.poly.2013.03.017

• Molecule based magnets
• Dicyanamide
• 2D square grid sheets
• Magnetic coordination polymers

The crystal structures and magnetic properties of four mu-(1,5) singly bridging dicyanamide complexes, specifically Mn{N(CN)(2)}(2)(DMSO)(2) (1), Fe{N(CN)(2)}(2)(DMSO)(2) (2), Co{N(CN)(2)}(2)(DMSO)(2) (3), and Ni{N(CN)(2)}(2)(DMSO)(2) (4), (DMSO = dimethyl sulfoxide) are presented. The compounds are isostructural, in which the M-II ions adopt a distorted octahedral geometry, coordinating to four nitrite N atoms of the dicyanamide ligand and to the two DMSO molecules, giving rise to (4,4) pseudo-2D square grid sheets. Magnetic interactions in these materials are via the five atom dicyanamide bridge [-N C-N-C N-], which is known to propagate weak magnetic exchange, and the complexes do not undergo long-range ordering down to 2 K. Single crystal X-ray diffraction, FTIR spectroscopy, CHN analyses, and SQUID magnetometry were used to characterize these materials.

• 出版日期2013-12-13