Université de Fribourg

Formation and Reactivity of [(tacn)-N-CO-Re(III)Br(CO)(2)](+) in Water : a Theoretical and Experimental Study

Zobi, Fabio ; Blacque, Olivier ; Steyl, Gideon ; Spingler, Bernhard ; Alberto, Roger

In: Inorganic Chemistry, 2009, vol. 48, no. 11, p. 4963-4970

The chemistry of [(tacn)-N-CO-Re(III)(CO)(2)Br]X (X = Cl or Br), obtained in good yield from the reaction of fac-[(tacn)Re(I)(CO)(3)]Br (1, tacn = 1,4,7- triazacyclononane) with X(2) in water, is described. The [(tacn)-N-CO-Re(III)(CO) (2)Br]X complex (2 with X = Br(-); 2a with X = BrCl(2)(-)), which we have previously communicated, is characterized by an unusual three-membered ring acyl amide...

Université de Fribourg

Synthesis and reactivity of the 17 e- complex [Re(II)Br4(CO)2]2 : A convenient entry into rhenium(II) chemistry

Zobi, Fabio ; Kromer, Lukas ; Spingler, Bernhard ; Alberto, Roger

In: Inorganic Chemistry, 2009, vol. 48, no. 18, p. 8965-8970

The reduction of (Et(4)N)[Re(III)Br(4)(CO)(2)] (1) by 0.5 equiv of tetrakis- dimethylaminoethylene in acetonitrile yields directly the air-stable, 17-electron Re(II) synthon (Et(4)N)(2)[Re(II)Br(4)(CO)(2)] (2) in nearly quantitative yield. The versatility of 2 as a synthon for Re(II) chemistry was demonstrated by substitution reactions of [Re(II)Br(4)(CO)(2)](2-) with different mono-, bi-,...

Université de Fribourg

Aerobically stable and substitutionally labile α-diimine rhenium dicarbonyl complexes

Schindler, Kevin ; Crochet, Aurélien ; Zobi, Fabio

In: RSC Advances, 2021, vol. 11, p. 7511-7520

New synthetic routes to aerobically stable and substitutionally labile α-diimine rhenium(I) dicarbonyl complexes are described. The molecules are prepared in high yield from the cis–cis–trans-[Re(CO)2(tBu2bpy)Br2]− anion (2, where tBu2bpy is 4,4′- di-tert-butyl-2,2′-bipyridine), which can be isolated from the one electron reduction of the corresponding 17-electron complex (1)....

Université de Fribourg

Continuous magnetic phase transition in artificial square ice

Sendetskyi, Oles ; Scagnoli, Valerio ; Leo, Naëmi ; Anghinolfi, Luca ; Alberca, Aurora ; Lüning, Jan ; Staub, Urs ; Derlet, Peter Michael ; Heyderman, Laura Jane

In: Physical Review B, 2019, vol. 99, no. 21, p. 214430

Critical behavior is very common in many fields of science and a wide variety of many- body systems exhibit emergent critical phenomena. The beauty of critical phase transitions lies in their scale-free properties, such that the temperature dependence of physical parameters of systems differing at the microscopic scale can be described by the same generic power laws. In this work we establish...