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1992 (3)
1Author    Juan Murgich, Yosslen Aray, Edgar Ospina, Rico, Ismardo BonaldeRequires cookie*
 Title    N NQR in 1,10-Phenanthroline and Dicyano bis(l,10-phenanthroline)iron(III)  
 Abstract    14 N NQR spectra of 1,10-phenanthroline and of dicyano bis(l,10-phenanthroline)iron(lll) were obtained at room temperature. An analysis based on the shifts of the NQR frequencies and in the topology of the charge distribution in a model (pyridine) showed that the complex formation produces a strong decrease in the N valence shell nonbonded maximum and an increase in the bonded density along each of the N-H bond directions. The NQR spectrum showed that the complex formation produces only small changes in the charge distribution of the cyanide groups. 
  Reference    Z. Naturforsch. 47a, 96—98 (1992); received August 3 1991 
  Published    1992 
  Keywords    14 N NQR, Phenanthroline, Complex, Charge distribution, Topology 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0096.pdf 
 Identifier    ZNA-1992-47a-0096 
 Volume    47 
2Author    Juan Murgich, Yosslen Aray, EdgarOspina RicoRequires cookie*
 Title    N NQR and the Molecular Charge Topology in Coordinated Ammonia  
 Abstract    14 N NQR spectra of [Co(NH3)6] • 3C1, [Co(NH3)5C03] • N03, [Zn(NH3)4] • 2C1, [Zn(NH3)4] • (BF4)2, and [Ag(NH3)4] • N03 were obtained at 77 K. The results, analyzed by means of the topology of the charge distribution obtained from ab-initio MO calculations of free and of a model of coordinated NH3, showed that bonding to the metal-ion produces a strong decrease (Co^>Zn %Ag) in the N nonbonded density ("lone pair") and an increase in the bonded maxima found in the N-H bond direction of the N valence shell. 
  Reference    Z. Naturforsch. 47a, 217—220 (1992); received August 3 1991 
  Published    1992 
  Keywords    14 N NQR, Ammonia, Complex, Charge distribution, Topology 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0217.pdf 
 Identifier    ZNA-1992-47a-0217 
 Volume    47 
3Author    HaeJin Kim, KeeTae Han, SungHo ChohRequires cookie*
 Title    Electric Field Effect on 14 N NQR in Ferroelectric Thiourea Single Crystals ** *  
 Abstract    The electric field effect on 14 N NQR in ferroelectric thiourea [SC(NH2)2] single crystals has been investigated at 77 K up to a field of 10 kV/cm. The measured Stark shifts are, in units of kHz • cm/ kV, dvj h /d£+ = 0.87±0.10, dvx + /d£_ = 1.17±0.20, dv2 + /d£+ = 0.80±0.10, and dv2 + /d£_ = 0.90 ±0.15. These values are on the order of 10 2 times those found in other ferroelectric crystals such as sodium nitrite (NaN02). The remarkable difference between these two Stark shifts is discussed by taking into account the polarizability and the local electric field at the 14 N sites in these crystals. 
  Reference    Z. Naturforsch. 47a, 227—231 (1992); received August 4 1991 
  Published    1992 
  Keywords    Electric field effect, Stark shift, 14 N NQR, Ferroelectric thiourea, Thiourea single crystal 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0227.pdf 
 Identifier    ZNA-1992-47a-0227 
 Volume    47