ISSN:
1572-901X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary The two new title compounds have been synthesized and characterized by x-ray crystal structure and spectroscopic measurements. Both compounds are air-stable and isomorphous. The crystal system, space group and Z for both compounds are: hexagonal, p61 and 6. Lattice constants for the CoIII and CrIII complexes are as follows:a = 9.674(3) Å,c = 37.196(6) Å anda = 9.786(3) Å,c = 37.852(6) A, respectively. The molecular structure shows a great distortion in the Fe-C-N-M torsion angle [−46.8(7)° and −51.3(7)°, respectively] which has been interpreted as due to the presence of the NO ligand. The spectral studies confirm the presence of the μ-cyano ligand by the clear splitting of the ν(CN) stretching vibration atca. 2200 cm−1 and the shift of 15–20 nm towards higher frequencies in the first d-d transition of MIII. The13C-n.m.r. spectrum of the diamagnetic CoIII complex confirms the presence of the μ-cyano ligand in solution and, as in the solid phase, the bridging group iscis to the NO of the nitroprusside. The Mössbauer spectra show that the principal axis component of electric field gradient tensor will most likely be directed in the Fe-NO direction (as in the nitroprusside ion) and not towards the CN bridge.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00619003
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