Multinuclear NMR studies of molybdenum and tungsten carbonyl isocyanide complexes

1989 ◽  
Vol 28 (15) ◽  
pp. 2954-2958 ◽  
Author(s):  
Martin Minelli ◽  
Walter J. Maley
Keyword(s):  
Nmr Studies ◽  
Multinuclear Nmr ◽  
Tungsten Carbonyl ◽  
And Tungsten

Manganese, molybdenum, and tungsten carbonyl derivatives incorporating the dimethylbis(1-pyrazolyl)gallate ligand, [Me2Ga(N2C3H3)2]−

1981 ◽  
Vol 59 (22) ◽  
pp. 3123-3135 ◽  
Author(s):  
Sharon E. Anslow ◽  
Kenneth S. Chong ◽  
Steven J. Rettig ◽  
Alan Storr ◽  
James Trotter
Keyword(s):  
Mirror Symmetry ◽  
Variable Temperature ◽  
Nmr Studies ◽  
Space Group ◽  
H Nmr ◽  
Carbonyl Derivatives ◽  
Distorted Octahedral Coordination Geometry ◽  
Distorted Octahedral ◽  
Tungsten Carbonyl ◽  
And Tungsten

The synthesis of a number of six-coordinate manganese, molybdenum, and tungsten carbonyl compounds incorporating both the bidentate bispyrazolyl gallate ligand, [Me2Ga(N2C3H3)2]−, and a neutral pyrazole ligand in a facial coordination arrangement are described. Variable temperature 1H nmr studies have revealed interestingly different behaviours in solution for the valence isoelectronic species [Me2Ga(N2C3H3)2](N2C3H4)Mn(CO)3 and [Me2Ga(N2C3H3)2](N2C3H4)Mo(CO)3−. X-ray structural analyses of crystalline samples of the two compounds have been carried out in an effort to shed light on these behavioural differences. Crystals of [Me2Ga(N2C3H3)2](N2C3H4)Mn(CO)3 are monoclinic, a = 31.053(2), b = 8.0503(4), c = 15.8629(8) Å, β = 108.164(2)°, Z = 8, space group C2/c and crystals of [(C2H5)4N]+{[Me2Ga(N2C3H3)2](N2C3H4)Mo(CO)3}− are monoclinic, a = 10.058(1), b = 20.6488(5), c = 13.533(1) Å, β = 93.800(5)°, Z = 4, space group P21/n. Both structures were solved by Patterson and Fourier syntheses and were refined by full-matrix least-squares procedures to final R values of 0.028 and 0.023 for 2613 and 4388 observed reflections for the Mn and Mo complexes, respectively. The neutral Mn complex and the complex Mo anion both have approximate mirror symmetry and both metal atoms have trigonally distorted octahedral coordination geometry. Important bond distances (corrected for thermal vibration) are: Mn—N, 2.074(3)–2.086(3), Mn—C, 1.795(4)–1.809(5), Mo—N, 2.291(2)–2.295(2), and Mo—C, 1.918(3)–1.936(3) Å. Although structural differences between these two species do offer plausible explanations for the differences observed in solution, it appears that other factors are more important.

Multinuclear NMR Studies on Homo-and Heterometallic Rhodium Clusters Containing 6 or More Metal Atoms

2008 ◽  
pp. 960-1000 ◽  
Author(s):  
Brian T. Heaton ◽  
Jonathan A. Iggo ◽  
Ivan S. Podkorytov ◽  
Daniel J. Smawfield ◽  
Sergey P. Tunik
Keyword(s):  
Nmr Studies ◽  
Multinuclear Nmr ◽  
Metal Atoms ◽  
Rhodium Clusters

Multinuclear NMR studies of lead(II) soaps II.13C and1H studies of solid and liquid-crystalline phases

1991 ◽  
Vol 9 (3) ◽  
pp. 417-432 ◽  
Author(s):  
G. Feio ◽  
H. D. Burrows ◽  
C. F. G. C. Geraldes ◽  
T. J. T. Pinheiro
Keyword(s):  
Liquid Crystalline ◽  
Nmr Studies ◽  
Crystalline Phases ◽  
Multinuclear Nmr ◽  
Liquid Crystalline Phases
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