Dithiooxalato-bridged Nickel Coordination Polymers: Synthesis and Structures

Investigation of the unique magnetic behaviours of isomers in a 1,2-dithiooxalato-bridged diiron(ii) complex

“…54,55 This model assumes that the S1 and O1 sites have mixed occupancy by the S1/O2 and O1/S2 atoms, respectively, with occupancy factors denoted as p 1 and p 2 (where p 1 + p 2 = 1). The analysis revealed that at an initial temperature of 90 K, the p 1 and p 2 factors were determined to be 0.672 (9) and 0.328 (9), respectively. Furthermore, the estimated ratios of the isomers 1-SymA, 1-SymB and 1-Asym were found to be 0.45(1), 0.108(6) and 0.44 (2), respectively.…”

“…1a). 2–23 This arrangement often leads to desirable physical properties such as ferromagnetism, 11–13 single-molecule magnets (SMMs), 14 charge-transfer (CT) phase transition 15–21 and ferroelectrics. 22 On the other hand, the studies of homonuclear complexes with dto are relatively rare.…”

“…/2 − z. ‡ The ratios of the isomers 1-symA, 1-symB and 1-Asym were determined using the formulas, p 1 × p 1 , (1 − p 1 ) × (1 − p 1 ) and 2 × {p 1 × (1 − p 1 )}, respectively, where p 1 represents the occupancy factor of the predominant atoms (O1 and S1); for example, a p 1 value of 0.672(9) at an initial temperature of 90 K gives 0.672 × 0.672, 0.328 × 0.328 and 2 × (0.672 × 0.328) for 1-SymA (0.45(1)), 1-SymB (0.108 (6)) and 1-Asym (0.44(2)), respectively.PaperDalton Transactions 150-200 K; 2nd, 200-350 K; and 3rd, 350-400 K. In the Δ(χ m T )/ΔT vs. T plot (Fig. 5), two distinct peaks corresponding to the abrupt 1st and 3rd SCO behaviours were observed, giving the transition temperatures T c1 = 184 K and T c3 = 371 K, respectively.…”