Polarised covalent thorium(iv)– and uranium(iv)–silicon bonds†
Benjamin L. L.
Réant, 
a
John A.
Seed,
a
Nikolas
Kaltsoyannis,
*a
Stephen T.
Liddle
*a
and
David P.
Mills
*a
a
John A.
Seed,
a
Nikolas
Kaltsoyannis,
*a
Stephen T.
Liddle
*a
and
David P.
Mills
*a
Abstract
We report the synthesis and characterisation of isostructural thorium(IV)– and uranium(IV)–silanide actinide (An) complexes, providing an opportunity to directly compare Th–Si and U–Si chemical bonds. Quantum chemical calculations show significant and surprisingly similar An%:Si%, 7s-, 6d-, and 5f-orbital contributions from both elements in polarised covalent An–Si bonds, and marginally greater covalency in the U–Si vs. Th–Si linkages.
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