Structural and magnetic characterizations of the first manganese(iii) Schiff base complexes involving hexathiocyanidoplatinate(iv) bridges

Towards a better understanding of magnetic exchange mediated by hydrogen bonds in Mn(iii)/Fe(iii) salen-type supramolecular dimers

“…In our previous work we have reported coordination compounds built from various [Mn III (L4)] + moieties bridged by [Pt(SCN) 4 ] 2− or [Pt(SCN) 6 ] 2− complex anions. 20,21 Almost all of the prepared compounds were trinuclear with the general formula [{Mn(L4)(Solv)} 2 {μ-Pt (SCN) x }], where x = 4 or 6, and they thus belong to group (A). For those compounds it was shown that the exchange interactions mediated by the diamagnetic bridging anion are negligible and it was proven that the dominant magnetic exchange pathway occurs via non-covalent interactions, i.e.…”

Investigation of Magnetic Exchange Pathways in Heterotrinuclear Manganese(III) Schiff Base Complexes Involving Tetrathiocyanidoplatinate(II) Bridges

“…The crystallographic data and structure refinement details are given in Table 3. [6] Table 1). They are all trinuclear complexes composed of two [Mn(L4)(Solv)] + units linked by the [Pt(SCN) 4 ] 2anion in a trans manner (Solv = CH 3 OH for 1a and 1b, H 2 O for 1c).…”

“…Upon lowering the temperature, a decrease in the effective magnetic moments was observed down to 2.30 (for 1a), 2.56 (for 1b), and 1.77 μ B (for 1c) at T = 1.9 K. This was ac- Figure 3, insets), which were observed in curves of the temperature dependence of molar magnetization. (1)] was used to interpret the magnetic data of complexes 1a-c: [20,6] (1) in which J is the isotropic exchange between the Mn III centers within the [{Mn(L4)(Solv)} 2 ] 2+ dimers, D is the ZFS parameter of the Mn III ion (D 1 = D 2 = D), and the Zeeman term describes interaction of the spins S i Ǟ with magnetic field B a Ǟ = (sinθ cosφ, sinθ sinφ, cosθ), for which we assumed g 1 = g 2 = g and g xy = g z = g. Finally, ϽS a Ͼ is a thermal average of the molecular spin projection in direction a, and zj is the molecular field correction parameter, which was incorporated with the aim to treat possible weak intrachain/ interchain interactions mediated through either diamagnetic [Pt(SCN) 4 ] 2anions or noncovalent contacts (hydrogen bonds, π-π stacking). However, the decrease in the effective magnetic moment can be also induced by other phenomena, such as zero-field splitting (ZFS) and intermolecular noncovalent interactions.…”

“…In the case of the diamagnetic [Fe(CN) 5 6 ] 3-, shows ferromagnetic exchange interactions within the chains, which leads to SCM behavior. As a good example, two heterometallic cyanido-bridged compounds can be mentioned.…”

“…However, the Solv molecules can expand structural dimensionality by acting as hydrogen-bonding donors in the formation of hydrogen bonds. [6] In this work, we report on the synthesis, structure, and mag- This substructure influences magnetic behavior significantly if non-negligible magnetic interactions (antiferromagnetic) are transmitted within the dimer.…”