Amidinate Ligands in Zinc coordination sphere: Synthesis and structural diversity

Abstract

A one-pot reaction involving neosilyllithium and three different carbodiimides (RN=C=NR, R = cyclohexyl, isopropyl and tert-butyl) in diethyl ether, followed by the addition of anhydrous ZnCl 2, afforded, in high yield, corresponding homoleptic zinc amidinate complexes having the molecular formulae [Zn{CyN=C(CH 2 SiMe 3)NCy} 2 ] (1), [Zn{ i PrN=C(CH 2 SiMe 3)N i Pr} 2 ] (2) and [Zn{ t BuN=C(CH 2 SiMe 3) N t Bu} 2 ] (3), respectively, and amidinato moieties in the zinc coordination sphere. Solid state structures of complexes 1-3 are reported thereafter-all the three complexes are isostructural, and each of them consists of two four-membered metallacycles.

Synthesis, characterisation and reactivity of a zinc triazenide for potential use in vapour deposition

“…13 Although there are many Zn(II) 1,3-dialkylamidinates and guanidinates in the literature, no volatility data has been reported. [14][15][16][17] Our previous ALD study using amidinates and guanidinates showed that decreasing the size of the carbon substituent on the ligand backbone improved both the physical properties and deposition chemistry of the precursor. 18 This makes the triazenide ligand, which differs from amidinates by having a nitrogen atom instead of a substituted carbon, a promising alternative for producing volatile Zn precursors.…”