Activation of P4 and P2 by Transition Metal Complexes at Room Temperature

1998 ◽  
Vol 37 (4) ◽  
pp. 507-510 ◽  
Author(s):  
Otto J. Scherer ◽  
Markus Ehses ◽  
Gotthelf Wolmershäuser
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Room Temperature

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.

N,N′-Bis(diphenyIphosphino)-S,S-dimethylsulfodiimin – ein Ligand für cyclische Übergangsmetallkomplexe/ N,N′-Bis(diphenylphosphino)-S,S-dimethylsulfodiimine – a Ligand for Cyclic Transition Metal Complexes

1988 ◽  
Vol 43 (8) ◽  
pp. 933-936 ◽  
Author(s):  
Herbert W. Roesky ◽  
Michael Zimmer ◽  
Regine Herbst ◽  
George M. Sheldrick
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Room Temperature ◽  
Cyclic Transition ◽  
Space Group

AbstractMe2SN2P2Ph4M(CO)4 complexes (1) (M: 1 a Cr, 1 b Mo, 1 c W) have been synthesized from Me2S(NPPh2)2 and C7H8M(CO)4 . 1a-1c are stable at room temperature, 1 b crystallizes in the space group P21212 with cell constants a = 2486.3(2); b = 1488.8(1); c = 882.0(1) pm.

Gehinderte Ligandbewegungen in Übergangsmetallkomplexen, XLIV [1]: Photoreaktionen von Hexacarbonyl-μ-η5:5-fulvalen-dimolybdän mit Allen / Hindered Ligand Movements in Transition Metal Complexes, XLIV [1]: Photoreactions of Hexacarbonyl-μ-η5:5 -fulvalene-dimolybdenum with Allene

1994 ◽  
Vol 49 (12) ◽  
pp. 1707-1716 ◽  
Author(s):  
Cornelius G. Kreiter ◽  
Wolfgang Conrad
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Uv Irradiation ◽  
Energy Barrier ◽  
Room Temperature ◽  
The Other ◽  
Hindered Rotation ◽  
Activation Barriers

Hexacarbonyl-μ-η5:5-fulvalene-dimolybdenum (1) reacts photochemically with allene to η2-allene-pentacarbonyl-μ-η5:5-fulvalene-dimolybdenum (2), μ-η2:2-allene-tetracarbonyl- μ-η5:5-fulvalene-dimolybdenum (4), and dicarbonyl-μ-η5:5-fulvalene-μ-η1:2:3-2-methylene- 4-penten-1,4-diyl-dimolybdenum (5). Complex 2 rearranges readily at room temperature to pentacarbonyl-μ-η1:3-2-propen-1,2-diyl-μ-η5:5-fulvalene-dimolybdenum (3). Upon UV irradiation 4 yields with an excess of allene μ-η2:2-Allene-pentacarbonyl-μ-η5:5-fulvalene-dimolyb-denum (2) shows a hindered rotation of the allene ligand with an energy barrier of ⊿G#303 = 53.3 ± 2 kJ/mol. Hexacarbonyl-μ-η5:5-bis(cyclopentadiendiyl)methane-dimolybdenum (6) reacts with allene to μ-η2:2-ailene-tetracarbonyl-μ-η5:5-bis(cyclopentadiendiyl)methane- dimolybdenum (7) and octacarbonyl-bis{μ-η5:5:1-(cyclopentadiendiyl-cyclopentadientriyl)-methanejdihydrido-tetramolybdenum (8). For μ-η2:2-allene-tetracarbonyl-μ-η5:5-fulvalene-dimolybdenum (4) and 7 a hindered ligand movement was detected, by which the bridging allene ligand changes from one the side of the molecule to the other. The activation barriers of these pseudo rotations were determined for 4 with ⊿G#303 = 57.4 ± 2 kJ/mol and for 7 with ⊿G#293 = 63.4 ± 2 kJ/mol. Hexacarbonyl-μ-η5:5-fulvalene-ditungsten, hexacarbonyl-μ-η5-bis(cyclopentadiendiyl)ethane-dimolybdenum and hexacarbonyl-μ-η5:5-bis(cyclopen- tadiendiyl)propane-dimolybdenum form no stable photoproducts with allene.

scholarly journals Synthesis, Complexation, Spectral and Antimicrobial Study of Some Novel 5-Bromo-2-Fluorobenzaldehydeoxime

2013 ◽  
Vol 8 ◽  
pp. 46-52 ◽  
Author(s):  
K. Kumar ◽  
N. Santhi
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Elemental Analysis ◽  
Room Temperature ◽  
Antimicrobial Activities ◽  
Spectral Studies ◽  
Ethanolic Solution ◽  
Mononuclear Complexes ◽  
Chloride Salts

In this newly approached method a novel series of Transition metal complexes were synthesized by the reaction of 5-bromo-2-fluorobenzaldehyde (1) react with hydroxylamine in ethanolic solution at room temperature. Mononuclear complexes were synthesized by reaction with Cu(II), Zn(II) and Hg(II) chloride salts. The complexes were characterized by elemental analysis, Ultraviolet, Infrared and 1HNMR spectral studies. The antimicrobial activities of the ligand and its metal complexes were estimated.

Mechanochemical changes on cyclometalated Ir(iii) acyclic carbene complexes – design and tuning of luminescent mechanochromic transition metal complexes

2020 ◽  
Vol 7 (3) ◽  
pp. 786-794 ◽  
Author(s):  
Jingqi Han ◽  
Kin-Man Tang ◽  
Shun-Cheung Cheng ◽  
Chi-On Ng ◽  
Yuen-Kiu Chun ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Carbene Complexes ◽  
New Class

A new class of luminescent cyclometalated Ir(iii) complexes with readily tunable mechanochromic properties derived from the mechanically induced trans-to-cis isomerization have been developed.

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