Dinitrogen complexes zirconium

In summary, we have shown that reaction of dinuclear zirconium dinitrogen complex, [p2n2]Zr(p-T]2-N2)Zr[p2n2] Al, (where P2n2= (PH3)2(NH2)2 is a model of the experimentally studied P2N2 =... 

The bis(i7-pentamethylcyclopentadienyl)zirconium dinitrogen complex [tj-C5(CH3)5kZrj(N2)3 (22), in solution reversibly releases its dinitrogen in vacuo over several hours (Section III,E). The solutions remaining are said to consist mainly of [T7-C5(CH3)5][T7-C5(CH3)4CH2]ZrH (23) (33). Permethylzirconocene [tj-C5(CH3 )5l,Zr (24) may exist in these solutions in equilibrium with this hydride tautomer (as in the case of titanium). However, thus far permethylzirconocene has not been isolated as a discrete compound or otherwise characterized. It is very likely that permethylzirconocene is less stable and more prone to form complex metallocene hydrides than permethyltitanocene (16). 

Figure 15 Representative P2N2 dianionic macrocyclic ligand, and a zirconium-dinitrogen complex supported by this P2N2 ligand.

Scheme 16 Synthesis of the bis(indenyl)zirconium dinitrogen complex 39 and its reactivity toward H2. ...

Pun D, Bradley CA, Lobkovsky E, Keresztes I, Chirik PJ. N2 hydrogenation from activated end-on Bis(indenyl) zirconium dinitrogen complexes. J Am Chem Soc. 2008 130 14046-14047. 

Bis(cyclopentadienyl)zirconium(III) complexes alkynyl-bridged complexes, 4, 749 dinitrogen complexes, 4, 747 electrochemical reduction, 4, 745 phosphido-bridged complexes, 4, 750 Bis(cyclopentadienyl)zirconium(IV) complexes electrochemical reduction, 4, 745 with M-C r/)-bonds, 4, 895 with M-C r/i2-bonds, 4, 887 with M-C r/i3-bonds, 4, 884 with M-H bonds, 4, 878 with M-N bonds, 4, 910 with M-0 bonds, 4, 917 with M-P bonds, 4, 927 with M-S bonds, 4, 930 with M-Si bonds, 4, 925 non-functionalized metallocene halides, 4, 870 ring-functionalized metallocene halides, 4, 874 Bis(cyclopentadienyl)zirconium(III) halides, in organic synthesis, 4, 754... 

Reduction of a toluene solution of bis(r>-pentamethylcyclopenta-dienyl)zirconium dichloride with sodium amalgam under dinitrogen yields the permanganate-red colored dinitrogen complex 22 (35)... 

Displacement of weakly coordinating ligands is another strategy for the preparation of zirconium alkyne complexes. Addition of diphenylacetylene to the weakly activated permethylzirconocene dinitrogen complex, [( -CsMes Zr 1-N2)]2(M2W-N2) 181, results in loss of free N2 and the formation of the alkyne adduct.98 Similarly, the... 

Zirconium/Hafnium(n) Dinitrogen Complexes 4.06.2.2.1 Bis(cyclopentadienyl)dinitrogen complexes... 

Dinuclear Bis-cyclopentadienyl Zirconium(m) Compounds 4.07.5.3.1 Dinitrogen complexes... 

Complex 3 was a real surprise. It contained a side-on bound dinitrogen fragment bridging the two zirconium centres with a N-N bond distance of 1.548(7) A, the longest N-N bond distance in a dinitrogen complex. When we... 

There are no dinitrogen complexes of any of these metals that contain a phosphine ligand. The considerable amount of nitrogen-fixing chemistry reported for titanium, and to a lesser extent zirconium, involves alkoxide, cyclopentadienyl, and halide complexes.The catalytic nitriding reactions of titanium will be reviewed in Section 3. 

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