The Bond Sn-Cl in Sn Complex Salts A2[(C2H5)SnCl5l. A Single Crystal

Zeeman C1 NQR spectroscopy has been applied to determine the magnitude and orientation of the E F G 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 N Q R frequencies v ;(Cl), the corresponding quadrupole coupling constants e Q f P ^ h ^ 1 , and the asymmetry parameters f/,(C 1) to certain Cl' atoms is discussed. The most probable assignment is (no. i of v,(Cl), v,(Cl)/MHz, eQ$?z r ' / M H z , f7, (Cl), no. k of assigned C l w , d(Sn-Cl" I ) /pm, * (fz are nearly parallel to the assigned bond directions Sn-Cl ( , I ) . >y(CI) is low, increasing with decreasing v(Cl). The reason for the asymmetry seems not to be a rc-character in the S n C l 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.