Hysteretic Spin Crossover above Room Temperature and Magnetic Coupling in Trinuclear Transition-Metal Complexes with Anionic 1,2,4-Triazole Ligands

2014 ◽  
Vol 20 (18) ◽  
pp. 5369-5379 ◽  
Author(s):  
Verónica Gómez ◽  
Jordi Benet-Buchholz ◽  
Eddy Martin ◽  
J. R. Galán-Mascarós
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Room Temperature ◽  
Spin Crossover ◽  
Magnetic Coupling

scholarly journals Reaktive π-Komplexe der elektronenreichen Übergangsmetalle, 11. Mitteilung/ Reactive π-Complexes of the Electron Rich Transition Metal Complexes, Part 11

1991 ◽  
Vol 46 (6) ◽  
pp. 729-737 ◽  
Author(s):  
Catherine Tolxdorff ◽  
Dongqi Hu ◽  
Bernhard Höferth ◽  
Hartmut Schaufele ◽  
Hans Pritzkow ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Coordination Sphere ◽  
Room Temperature ◽  
Iron Complexes ◽  
Iron Complex

The highly reactive arene iron complex [(η4-toluene)(η6-toluene)iron] allows the formation of C4-units from alkynes below room temperature. By this route butadiene-, cyclobutadiene-, and ferracyclopentadiene(arene)iron complexes are accessible. Synthesis, structure and the properties of one example each are reported. Ferracyclopentadienes are potential intermediates for the catalytic cyclotrimerization of alkynes in the coordination sphere of arene iron complexes.

Transition Metal Complexes with Sulfur Ligands, IV. Synthesis and Reactions of Mo (IV) Complexes with the Tetradentate Thioether-thiol Ligand 2,3,8,9-Dibenzo-1,4,7,10-tetrathiadecane

1983 ◽  
Vol 38 (5) ◽  
pp. 562-567 ◽  
Author(s):  
Bharat B. Kaul ◽  
D. Sellmann
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Room Temperature ◽  
Reducing Agents ◽  
Synthesis And Characterization ◽  
Reducing Conditions ◽  
Thiol Ligand

AbstractSynthesis and characterization of non-oxo Mo(IV) complexes with the tetradentate thioether-thiol ligand 2,3,8,9-dibenzo-1,4,7,10-tetrathiadecane(dttd-H2) are reported. MoCl4(THF)2 reacts with dttd-H2 in THF at room temperature to give the paramagnetic (2.61 BM, 295 K) [Mo(dttd)Cl2]. The chlorine ligands in [Mo(dttd)Cl2] can be substituted by sulfur ligands yielding diamagnetic complexes as [Mo(dttd)(CeH4S2)], [Mo(dttd)(SC2H4S)] and [Mo(dttd)(SC2H5)2]; with Na2S, NaHS or H2S, the di-μ-sulfido bridged complex [(dttd)Mo(S)2Mo(dttd)] is obtained. The reduction of [Mo(dttd)Cl2] by various reducing agents in the presence of CO or NO yields labile carbonyl and nitrosyl species in solution. In contrast to [Mo(dttd)Cl2], the complexes with MoSe cbromophores showed no reactivity to CO or NO under reducing conditions.

Transition metal complexes of substituted alkynes. VIII. Complexes of cobalt derived from 1,1,1-Trifluorobut-2-yne

1970 ◽  
Vol 23 (12) ◽  
pp. 2403 ◽  
Author(s):  
RS Dickson ◽  
PJ Fraser
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Room Temperature ◽  
Spectroscopic Studies ◽  
Temperature Treatment ◽  
Substitution Pattern ◽  
Alkyne Complexes

The complex Co4(CO)10(CF3C2CH3) is formed at room temperature from dodecacarbonyltetracobalt and 1,1,1-trifluorobut-2-yne. Another monoalkyne complex Co2(CO)6(CF3C2CH3) has been prepared from octacarbonyldicobalt and 1,1,1-trifluorobut-2-yne at room temperature. Treatment with triphenylphosphine converts the complex into Co2(CO)4[P(C6H5)3]2(CF3C2CH3). At 150�, reaction of Co2(CO)6(CF3C2CH3) and 1,1,1-trifluorobut-2-yne gives a small amount of a purple complex which is believed to be Co2(CO)4(CF3C2CH3)3. Similar reactions involving Co2(CO)4(CF3C2CH3) and the alkynes hexafluorobut-2-yne and 3,3,3-trifluoropropyne give the complexes Co2(CO)4(CF3C2CH3)(CF3C2CF3)2 and Co2(CO)4(CF3C2CH3)(CF3C2H)2. Spectroscopic studies have led to an assignment of the substitution pattern in these latter complexes. Tris-alkyne complexes were not isolated from similar reactions between 1,1,1-trifluorobut-2-yne and the complexes Co2(CO)6(CF3C2CF3) and Co2(CO)6(CF3C2H). Three isomers of the π-cyclopentadienone-π-cyclopentadienylcobalt complex, [(CF3C2CH3)2CO]Co(π-C5H5), were obtained from (π-C6H6)Co(CO)2 and 1,1,1-trifluorobut-2-yne after U.V. irradiation for several days. The isomers vary in the arrangement of the substituents attached to the cyclopentadienone ring. All reactions involving 1,1,1-trifluorobut-2-yne have been compared with similar reactions involving the related alkynes hexafluorobut-2-yne and but-2-yne.

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