nitroxide Complexes of Diruthenium(II,II) Carboxylates. Structural and Magnetic Properties

Systematic Tuning and Switching of Neutral and Ionic Phases in a Donor–Acceptor Chain Compound by Doping with Less‐Active Donors and by Pressure Application

“…Characteristic anomalies that indicated transition were no longer seen for 0.24 , which showed typical isolated [Ru 2 II,II ] unit behavior. The χ versus T plot for 0.24 over the whole temperature range was simulated using a Curie equation, with S =1 used for 1 (see above),23, 24 and an estimated parameter set, with a simulation curve (a solid pale blue line in Figure 4a) of g =2.0 (fixed), D S =1 / k B =358(3) K, and χ TIP =159(29)×10 −6 cm 3 mol −1 , and a ρ imp of 0.00760(6) (×100=0.76 %). The estimated D S =1 values were consistent with the values expected for [Ru 2 II,II ] 22.…”

“…The magnetic behavior was found to be typical for an isolated [Ru 2 II,II ] species (i.e., with diamagnetic DMDCNQI 0 ). The χ versus T plot was simulated using a Curie equation with S =1,22–24 by taking into account zero‐field splitting ( D S =1 ), temperature‐independent paramagnetism ( χ TIP ), and [Ru 2 II,III ] + species impurities ( ρ imp ) with S =3/2, and by using an adequate parameter set of g =2.0 (fixed), D S =1 / k B =410(4) K, and χ TIP =161(30)×10 −6 cm 3 mol −1 , and a ρ imp value of 0.0043(1) (×100=0.43 %) (Figure S1 in the Supporting Information) relative to that found for typical isolated [Ru 2 II,II ] complexes 23. 24 From these works on 1 , we found that the [Ru 2 (F5)] unit has the potential to act as a “neutral D dopant” and become embedded in a DA chain.…”

The first crystal structure of a one-dimensional chain of linked RuIIRuII units

“…Expected magnitudes for the temperature independence paramagnetism (TIP) of a 3 A 2g ground state are in the range (10-30) × 10 Ϫ5 cm 3 mol Ϫ1 . 21 Although any fitting of the aforementioned kind must be interpreted with caution, one point emerges very clearly. Superexchange interactions between the Ru II 2 units through the (O 2 CCH 3 ) 4 (Pyz)] ϩ } ∞ with pyrazine bridges in which zJ = Ϫ2.3 cm Ϫ1 .…”

Hexagonal Layered Materials Composed of [M2(O2CCF3)4] (M=Ru and Rh) Donors and TCNQ Acceptors

“…A large zero-field splitting arising from the S 1 Ru II;II 2 units (D $ 300 cm À1 ) contributes to the reduced moments observed at low temperatures, [25] but the moment at room temperature is already significantly less than the expected value of c M T 2.0 cm 3 K mol À1 for two isolated S 1 spin centers. A large zero-field splitting arising from the S 1 Ru II;II 2 units (D $ 300 cm À1 ) contributes to the reduced moments observed at low temperatures, [25] but the moment at room temperature is already significantly less than the expected value of c M T 2.0 cm 3 K mol À1 for two isolated S 1 spin centers.…”