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Zeeman  35 Cl NQR spectroscopy has been applied to determine the magnitude and orientation of the EFG tensors at the chlorine sites in a single crystal of(CH 3 NH 3 ) 2 [(C 2 H 5 )SnCl 5 ] at 293 K. The assignment of the NQR frequencies v i ( 35 Cl), the corresponding quadrupole coupling constants eQΦ (i)  zz  h -1  , and the asymmetry parameters η i ( 35 Cl) to certain Cl (k)  atoms is discussed. The most probable assignment is (no. i of v i ( 35 Cl), v i ( 35 Cl)/MHz, eQΦ (i)  zz  h -1  / MHz η i , ( 35 Cl), no. k of assigned Cl (k) , d(Sn-Cl (k)  )/pm, ∢ (Φ (i)  zz ,  d(Sn-Cl (k)  )) :i = 1,17.032, 34.046,0.056, k= 1, 242.6, 3.1°; i = 2, 12.072, 24.089, 0.117, k = 3, 250.7, 1.9°; i = 3, 11.537, 22.992, 0.146, k = 2, 253.1, 2.8°; i = 4, 10.770, 21.455, 0.154, k = 4, 249.7, 2.9 °; i = 5,9.969,19.842,0.171, k=5,254.9,1.7°. The orientation of the tensor axes Φ (i)  jj ,  j = x, y, z,  i= 1 - 5 , in space is mainly determined by the geometry of the [(C 2 H 5 )SnCl 5 ] 2⊖  anion. The Φ (i)  zz   are nearly parallel to the assigned bond directions Sn-Cl (k)  · η ( 35 CI) is low, increasing with decreasing v( 35 Cl). The reason for the asymmetry seems not to be a π-character in the Sn-Cl bond, but the charge distribution within the anion. The rule that a longer bond corresponds to a lower NQR frequency is valid as a general tendency, but not strict.

zeitschrift für naturforschung a

The Bond Sn-Cl in Sn IV  Complex Salts A 2  [(C 2 H 5  )SnCl  5 ]. A Single Crystal  35 Cl NQR Study of Bis(methylammonium)- pentachloroethylstannate, (CH 3 NH 3  ) 2 ](C 2 H 5  )SnCl 5 ]