A functionalized elastomer defined by the formula ##STR00001## where .pi. includes a polymer chain, .theta. includes a group 14 element, R.sup.1 and R.sup.2 each independently include hydrogen, a monovalent organic group, or a polymer chain, R.sup.3 and R.sup.4 each independently include a divalent organic group or a covalent bond, R.sup.5, R.sup.6, R.sup.7, R.sup.8 and R.sup.9 each independently include a monovalent organic group or a hydrogen atom.