Crystal structures of two ytterbium(III) complexes comprising alkynylamidinate ligands

Abstract

Two ytterbium(III) complexes comprising alkynylamidinate ligands, Cp2Yb[(iPr2N)2C—C≡C—c-C3H5] (1) and Yb[(CyN)2C—C≡C—Ph]3 (Cy = cyclo­hex­yl) (2) have been synthesized and structurally characterized. Both complexes are monomers without any coordinated solvent in the solid state.

Synthesis and Structural Characterization of Divalent Transition Metal Alkynylamidinate Complexes

“…In the first step the easily accessible lithium cyclopropylethynylamidinate precursors Li[ c ‐C 3 H 5 −C≡C−C(NR) 2 ] ⋅ THF (R= i Pr, Cy) [36] were prepared and structurally characterized. Further in the course of this study, a surprising variety of transition metal and lanthanide alkynylamidinate complexes terminated by cyclopropyl groups could by synthesized and fully characterized [37–44] . In this contribution we now report the synthesis and characterization of several new first and second row transition metal complexes comprising the cyclopropylethynylamidinate ligands.…”

“…Further in the course of this study, a surprising variety of transition metal and lanthanide alkynylamidinate complexes terminated by cyclopropyl groups could by synthesized and fully characterized. [37][38][39][40][41][42][43][44] In this contribution we now report the synthesis and characterization of several new first and second row transition metal complexes comprising the cyclopropylethynylamidinate ligands.…”

Synthesis and structural characterization of four dichloridobis(cyclopropylalkynylamidine)metal complexes

“…In a first study, we described the synthesis and characterization of a series of lithium cyclopropylethinylamidinates, Li[c-C 3 H 5 -C C-C(NR 0 ) 2 ] [R 0 = i Pr, Cy (= cyclohexyl)], which are readily accessible on a large scale using commercially available starting materials (cyclopropylacetylene, N,N 0 -diorganocarbodiimides; Sroor et al, 2013). Subsequently, these ligands have been employed for the preparation of new di-and trivalent lanthanide complexes (Sroor et al, 2015a(Sroor et al, ,b,c,d, 2016Wang et al, 2016). More recently, we became interested in the chemistry of 3d metal complexes containing cyclopropylethinylamidinate ligands.…”

Synthesis and Complexation Study of New Aminoalkynyl−amidinate Ligands

“…Our own contributions to the coordination chemistry of alkynylamidinate anions in recent years focused on alkynylamidinate anions with R=cyclopropyl ( c ‐C 3 H 5 ) because of the unique electronic properties of the cyclopropyl group [21,22] . Starting from the readily available lithium cyclopropylethynylamidinate precursors Li[ c ‐C 3 H 5 −C≡C−C(NR) 2 ] ⋅ THF (R= i Pr, Cy), [23] a surprising variety of transition metal and lanthanide alkynylamidinate complexes could be synthesized and fully characterized [24–30] . In this contribution we now report the synthesis of the new amino‐functionalized alkynylamidinate ligands [Me 2 N−CH 2 −C≡C−(NR) 2 ] − (R = i Pr, Cy) as well as an initial complexation study with selected transition metals (vanadium, iron, and molybdenum).…”

“…[21,22] Starting from the readily available lithium cyclopropylethynylamidinate precursors Li[c-C 3 H 5 À C�CÀ C(NR) 2 ] • THF (R= i Pr, Cy), [23] a surprising variety of transition metal and lanthanide alkynylamidinate complexes could be synthesized and fully characterized. [24][25][26][27][28][29][30] In this contribution we now report the synthesis of the new aminofunctionalized alkynylamidinate ligands [Me 2 NÀ CH 2 À C�CÀ (NR) 2 ] À (R = i Pr, Cy) as well as an initial complexation study with selected transition metals (vanadium, iron, and molybdenum).…”