P-Block metal complexes with bis(pyrazol-1-yl)acetato ligands. Issue 10 (15th February 2022)

• Record Type: Journal Article
• Authors: Pflock, Stephan; Langer, Frauke; Reil, Michaela; Strinitz, Lisa; Lorenz, Rebecca; Hübner, Eike G.; Burzlaff, Nicolai
• Is Part Of: Dalton transactions. Volume 51:Issue 10(2022)
• Page Start: 3902
• Page End: 3912
• Publication Date: 2022-02-15
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt04040e
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Sn(ii ) and Ga(iii ) complexes bearing bis(pyrazol-1-yl)acetato (bpza) or bis(3, 5-dimethylpyrazol-1-yl)acetato (bdmpza) ligands are reported. The homoleptic complexes exhibit either mononuclear or dinuclear molecular structures. Abstract : The hetereoscorpionate ligands bis(pyrazol-1-yl)acetic acid (Hbpza) and bis(3, 5-dimethylpyrazol-1-yl)acetic acid (Hbdmpza) are reacted with [Sn(OAc)2 ] or [Sn(acac)2 ] to yield the corresponding Sn(ii ) complexes. A single crystal X-ray determination for the in solution monomeric complex [Sn(bpza)2 ] (1a ) revealed a dinuclear molecular structure [Sn2 (bpza)4 ] (1b ), with κ 3 -N, N, O-coordinated bpza ligands at each of the Sn(ii ) and two bpza ligands μ-bridging between the Sn(ii ) centres. The molecular structure of [Sn(bdmpza)2 ] (2 ) exhibits a homoleptic bisligand complex with both ligands displaced by the free electron pair, which is proven by DFT calculations. Oxidation of complex 2 in an attempt to synthesize a homoleptic Sn(iv ) complex leads to the formation of [Sn(bdmpza)F3 ] (3 ). In addition, homoleptic bisligand gallium complexes [Ga(bdmpza)2 ][ClO4 ] (4 ) and [Ga(bpza)2 ][GaCl4 ] (5 ) were prepared and characterized by 71 Ga NMR and IR spectroscopy as well as by X-ray crystallography.