Lutetium oxo clusters utilizing mixed ligand System: Isolation of a rare Lu4 oxo cluster in a tetrahedral architecture

Mononuclear organogermanium(iv) catalysts for a [3 + 2] cycloaddition reaction

“…The reactions of 2-amino-4-nitrophenol or 2-aminophenol with the corresponding aldehydes (salicylaldehyde or o -vanillin) led to the formation of three polydentate pro-ligands, H 2 L 1 , H 2 L 2 , and H 2 L 3 (Scheme 1). 59–61 The formation of these pro-ligands was confirmed by FT-IR spectroscopy, 1 H and 13 C{ 1 H} NMR spectroscopy. The spectral data matched the reported data for these pro-ligands.…”

“…S1–S3, ESI†). 60,61 Furthermore, the band resulting from the stretching of CN bonds is shifted to 1607–1614 cm −1 in compounds 1–3 . 62,63 Thus, the ligands in compounds 1–3 are deprotonated and bonded to the Ge( iv ) centre via the nitrogen atom of the azomethine (CN) group and phenolic oxygen atoms.…”

“…S1–S3, ESI†). 61 However, the band owing to O–H stretching vibration is diminished or not detected in compounds 1–3 (Fig. S1–S3, ESI†).…”

“…The spectral data matched the reported data for these pro-ligands. [59][60][61] The reaction of pro-ligands H 2 L 1 , H 2 L 2 , and H 2 L 3 with (C 6 H 5 ) 2 GeCl 2 in the presence of triethylamine resulted in three mononuclear compounds [(C 6 H 5 ) 2 Ge(L 1 )] (1), [(C 6 H 5 ) 2 Ge(L 2 )] (2), and [(C 6 H 5 ) 2 Ge(L 3 )] (3) (L 1 , L 2 , L 3 = deprotonated form of the respective pro-ligand), respectively. All reactions were carried out in an inert environment.…”

“…It was not possible to obtain Scheme 1 Syntheses of pro-ligands, H 2 L 1 , H 2 L 2 , and H 2 L 3 . [59][60][61] Scheme 2 Syntheses of compounds 1-3.…”