Der erste Metallakronenether‐Sandwichkomplex

Abstract

Kronenether haben Zuwachs bekommen! Neben den Kronenether‐Sandwichkomplexen 1 existieren topologisch äquivalente Metallakronenethersandwichkomplexe 2. Diese entstehen in einer Eintopfreaktion durch Selbstorganisation und wurden in einem Fall durch eine röntgenographische Kristallstrukturanalyse zweifelsfrei charakterisiert.magnified image

Metal-Directed Formation of Tetra-, Hexa-, Octa-, and Nonanuclear Complexes of Magnesium, Calcium, Manganese, Copper, and Cadmium

“…In addition, the coordinated isopropanol accounts for peaks at d 1.02 (d, CH 3 ), 1.80 (d, -OH) and 3.86 (sept, CH). [6] Recently we pointed out the structural analogy between the classical crown ethers, cryptands, spherands and their inclusion complexes, and the class of topologically analogous metalla-crown ethers (MC), [9,10] metalla-cryptands, [2] and metalla-spherands [4] and their inclusion compounds. [4] However, this methodology does not work in the case of ethyl acetate and oxalylchloride.…”

“…The metal-directed self-assembly of polydentate ligands with transition metal ions leads to metalla-crown ethers, [7] which are topological analogues of crown ethers. [9,10] A few of our notable advances in this area are detailed below. The readiness of metalla-crown ethers of copper(ii) and dialkylketipinate dianions to coronate is highlighted in the formation of metalla-coronates [9] and metalla-crown ether sandwich complexes.…”

Metal-Directed Formation of Tetra-, Hexa-, Octa-, and Nonanuclear Complexes of Magnesium, Calcium, Manganese, Copper, and Cadmium

“…On each face of the imaginary tetrahedron constituted by the four magnesium ions, three oxygen atoms are in ideal positions to bind an ammonium ion through three hydrogen bonds. [6] Recently we pointed out the structural analogy between the classical crown ethers, cryptands, spherands and their inclusion complexes, and the class of topologically analogous metalla-crown ethers (MC), [9,10] metalla-cryptands, [2] and metalla-spherands [4] and their inclusion compounds. If one applies the knowledge about crown ethers to the chemistry of metalla-crown ethers, then the complexation of different sized cations by metalla-crown ethers should lead to metallacoronates of different structures.…”

“…The readiness of metalla-crown ethers of copper(ii) and dialkylketipinate dianions to coronate is highlighted in the formation of metalla-coronates [9] and metalla-crown ether sandwich complexes. [9,10] A few of our notable advances in this area are detailed below. Herein we describe a convenient procedure for the synthesis of dialkyl ketipinates and tetraketones H 2 L 1, [11] and we also outline the potential of L 2À as tetradentate binucleating ligands for various metal(ii) ions; this leads to octanuclear complexes [M 8 L 8 ]´4 Y (2 ± 5), tetrahemispheraplex [(4 NH 4 …”

Synthese und Struktur vier‐ und achtkerniger Chelatkomplexe – exohedraler Gastaustausch an Tetrahemispheraplexen

“…(t, 12H; CH,); "C-NMR (100.5 MHz, CDCI,): 6 =184. 4,170.9,167.2 (24 C z O ,',CDCI,): 6 =184.4,170.8,167.3 (24 C 4 ,12 C=O),95.3 (12 =C),52.0,51.2 (240CH3),41.5 (4NCH,),31.9,29.7,29.6,29.4,29.3,28.7,26.9,26.3,22.7 (36 von 40 CH,,pro 66,175.17,175.10,174.26,173.89,173.20,zwei Signale fallen zusammen),87.82,87.73,84.42,83.35 (16 =CH),51.52,50.79,50.68,50.43 (16 OCH,) [12], 2.47 (br. s, 8H; H,O), 1.39, 1.28, 1.19, 1.11 (t. je 12H, CH,); I3C-NMR (100.5MHz, CDCI,): 6 ~1 7 7 .…”