A Mössbauer-effect study of the bonding in compounds containing tin–transition-metal bonds

Abstract

The sign of the quadrupole coupling constant, e²qQ, has been determined for ¹¹⁹Sn in the following six compounds: [Mn(CO)₅SnCl₃], [Mn(CO)₅SnCl₂Me], [Fe(π-C₅H₅)(CO)₂SnCl₃], [Fe(π-C₅H₅)(CO)₂SnBu₃], [{Fe(π-C₅H₅)(CO)₂}₂SnCl₂], and [{Fe(π-C₅H₅)(CO)₂}₂Sn(NCS)₂]. It was found to be positive for all of the compounds except [Fe(π-C₅H₅)(CO)₂SnBu₃], which has a small negative value for e²qQ. In those compounds containing iron, the sign of e²qQ for ⁵⁷Fe was also determined and found to be positive in each case. The nature of the bonding in these and similar compounds is discussed in relation to results obtained from other physical methods.