Synthesis and structure of η5-bonded pyrrolyl complexes of calcium and strontium

Abstract

Calcium and strontium diiodide react with 2,5-di-tertbutylpyrrolylsodium in THF yielding [M(pyr*) 2 (THF)] (M = Ca, Sr; pyr* = NC 4 H 2 Bu t 2 -2,5) for which NMR spectra and the X-ray structures confirm the h 5 -bonding character of the ligands.

Advances in alkaline earth-nitrogen chemistry

“…The most prominent pyrrole derivatives are based either on substituted pyrrolato complexes of the form [M(pyr*) 2 (thf)] (where M = Ca, Sr, and pyr* = 2,5-di-tert-butylpyrrolate) or [159,160]. The calcium complexes of 2-DMAMP exhibit 6-coordinate metal centers, with the THF and pyridine adducts displaying trans-oriented ligands and donors and the DME and TMEDA adducts displaying cis-oriented ligands (Fig.…”

Synthesis, Structures and Characterization of the Calcium Pyrrolates [Ca{(2‐(dimethylaminomethyl)pyrrolyl}2 donorn] (donor = THF and pyridine, n = 2; DME and TMEDA, n = 1) as Potential Precursors for Solid‐State Applications

“…η 5 Coordination, as observed for di-tert-butylsubstituted pyrrolates of calcium and strontium, [22] or cal- . Computer-generated plot of 4 with anisotropic displacement parameters depicting 30% probability for all non-carbon atoms; the hydrogen atoms have been omitted for clarity Figure 5.…”

“…[19] Pyrrolylcalcium and -strontium derivatives with two tertbutyl substituents have been reported. [22] This sterically demanding ligand disfavors the η 1 -type bonding observed in the 2-DMAMP compounds; instead, π-bonding involving an η 5 arrangement is observed. A related metal geometry is also observed in a calcium porphyrinogen derivative.…”

Zinc complexes incorporating with symmetrical and asymmetrical polydentate nitrogen-donor pyrrolyl ligands: Synthesis, characterization, and ring-opening polymerization

“…Crystallographic data for the structures reported in this paper have been deposited with the Cambridge Crystallographic Data Centre with CCDC numbers 874324 (1), 874325 (2), 874322 (3), 874323 (4), and 874321 (5). These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.…”