The First (μ-Oxo)diferric Chain Complex:  Structure and Magnetic Properties of [Fe₂(tren)₂(mtm)O]_n(CF₃SO₃)_nCl_n

Abstract

A novel synthetic route to the title complex was devised by utilizing mtm and tren as the bridging and end-capping ligands, respectively. The X-ray analysis reveals that in this molecular “ferric train” magnetically isolated Fe−O−Fe cars are uniquely connected by mtm connectors.

Combined Effects of Diamines and Carboxylate Bridges on Structural and Magnetic Properties of a Series of Polynuclear Copper(II) Complexes with 1,1-Cyclobutanedicarboxylic Acid

“…In this coordination mode one oxygen atom from each carboxylate group bond with a different metal as unidentate, while the remaining oxygen remains uncoordinated. This coordination mode only appears in two infinite helical chains with Zn as a metal and malonate and ethylmalonate as the bridging ligand and in two other polymer compounds , where the malonate bridge alternates with other bridges. In all cases the crystal structures are stabilized by an extensive network of intra- and interlayer hydrogen bonds.…”

“…In this coordination mode one oxygen atom from each carboxylate group bond with a different metal as unidentate, while the remaining oxygen remains uncoordinated. This coordination a Symmetry transformations used to generate equivalent atoms: #1, x -1 /2, -y + 1 /2, z -1 /2; #2, x, y -1, z; #3, x + 1 /2, -y + 1 /2, z + 1 /2; #4, x, y + 1, z. a Symmetry transformations used to generate equivalent atoms: #1, x, -y -1 /2, z + 1 /2; #2, x -1, y, z; #3, x, -y -1 /2, z -1 /2; #4, x + 1, y, z; #5 -x, -y, -z -1. a Symmetry transformations used to generate equivalent atoms: #1, -x + 1, -y + 1, -z + 2. mode only appears in two infinite helical chains with Zn as a metal and malonate 21 and ethylmalonate 22 as the bridging ligand and in two other polymer compounds 23,24 where the malonate bridge alternates with other bridges. In all cases the crystal structures are stabilized by an extensive network of intra-and interlayer hydrogen bonds.…”

A novel one-dimensional nickel(II) alternating chain from discrete pyrazolate-based dinuclear complexes

“…1,2 Thereby the interest has extended from dinuclear to oligonuclear and polymeric compounds, and some of the more recent work in low-dimensional magnetism has focused on one-dimensional exchange-alternating linear chains with local spins S > ¹ 2. [3][4][5] The theoretical treatment of the J-alternating S = 1 chain by Borrás-Almenar and co-workers 6 strongly stimulated experimental searches for systems of this kind, however fully characterised examples have still remained rare 3,4, 7 and in most cases are derived from the co-ordinative versatility of the multidentate azido ligand. 4, 8 While the general and most often pursued synthetic strategy, i.e.…”

High-Dimensional Manganese(II) Compounds with Noncovalent and/or Covalent Bonds Derived from Flexible Ligands: Self-Assembly and Structural Transformation

“…In this criterion, we simplified the magnetic system to the exchange coupling in a dinuclear Mn(II) unit bridged by the carboxylate groups of tp ligands. The solution to the Van Vleck expression using the isotropic Heisenberg Hamiltonian for the dimanganese(II) entity written as H = − JS 1 · S 2 ( S 1 = S 2 = 5 / 2 ) yields the magnetic susceptibility χ m described in eq 2, where x = J / kT .…”