1996
DOI: 10.1002/zaac.19966220515
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Homo‐atomic Nine‐vertex Polyhedra of Group XIV Elements. Crystal structures and paramagnetic properties of [K‐(2,2,2‐crypt)]6E9E9 · 1.5 ethylenediamine · 0.5 toluene, E = Sn and Pb

Abstract: The extractions of alloys of the nominal composition hedra. 2 b: space group P2,/c (,No. 14), Z = 4, a = 28.042(8), "KE225" with ethylenediamine (en), (2,2,2)crypt, and toluene b = 23.527(5), c = 27.703(8) A, / 3 = 93.46(2)"; 2c: space (tol) lead in good yields to paramagnetic compounds of the group P2,/c (No. 14), Z = 4, a = 28.356(8), b = 23.757(5), composition [K-(2,2,2-crypt)16E9E9 . 1.5 en . 0.5 to1 (E = Sn c = 27.885(8) A, p = 94.01(2)". (2b), Pb (2c)). X-ray single crystal structure analyses show that t… Show more

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Cited by 66 publications
(49 citation statements)
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“…This lack of coordinating cations is compensated by a slight shift of the two Ba caps towards the singly bridged SiÀSi bond. The sensitivity by which the bond lengths of the Si 3 unit react to such slight changes of the local coordination supports impressively the above-mentioned arguments towards a fairly soft and polar- 62.17 (9) izable kind of Zintl anion. Finally, each silicon vertice is coordinated by two additional terminal barium cations.…”
Section: Methodssupporting
confidence: 58%
“…This lack of coordinating cations is compensated by a slight shift of the two Ba caps towards the singly bridged SiÀSi bond. The sensitivity by which the bond lengths of the Si 3 unit react to such slight changes of the local coordination supports impressively the above-mentioned arguments towards a fairly soft and polar- 62.17 (9) izable kind of Zintl anion. Finally, each silicon vertice is coordinated by two additional terminal barium cations.…”
Section: Methodssupporting
confidence: 58%
“…Sie besta È tigten das von Zintl durch potentiometrische Titrationen bestimmte Sn 9 4± -Polyanion. Mit der Einfu È hrung des Kryptanden [2.2.2]-crypt [16] durch Corbett [17], gelang die strukturelle Charakterisierung einer Reihe von Polyanionen der schweren Elemente der Gruppe 14: Ge 5 2± [18], Sn 5 2± , Pb 5 2± [19], Ge 9 3± [20,21], [Ge 9 Ge 9 ] 6± [22], Sn 9 4± [23,24], Sn 9 3± [25], [Sn 9 Sn 9 ] 6± [26], Pb 9 4± [27], Pb 9 3± [21], [Pb 9 Pb 9 ] 6± [26] und Ge 10 2± [20]. In ju È ngster Zeit konnten die Strukturen neunatomiger Cluster E 9 4± auch an Einkristallen bina È rer Phasen der Zusammensetzung Rb 12 Si 17 [28], Cs 4 Ge 9 [29], Rb 12 Ge 17 [30], K 4 Pb 9 [31] und Cs 4 Pb 9 [29] -Anionen stabile 22-Elektronencluster vom nido-Typ (2 n + 4 Elektronen mit n = Zahl der Polyederecken).…”
Section: Introductionunclassified
“…Wa È hrend Clusterverbindungen der schwereren Homologen der Kohlenstoffgruppe (E = Ge, Sn, Pb) in Form lo È slicher Anionen (Zintl-Ionen) ha È ufiger auftreten (Sn 5 2± , Pb 5 2± [1], Ge 9 3± [2,3], Ge 9 4± /Ge 9 2± [4], Ge 10 2± [2], Sn 9 4± [5±7], Sn 9 3± [8,9], Pb 9 3± [9], Pb 9 4± [10]), werden isolierte oder verknu È pfte Clustereinheiten in bina È ren oder terna È ren Zintl-Phasen A x M y E z (A = Alkali-, M = Erdalkalimetall, E = Ge, Sn, Pb) seltener beobachtet. Isolierte tetraedrische Einheiten treten in den Verbindungen mit NaSi, NaPb, KGe, Ba-Si 2 Strukturtyp auf, die von einer Vielzahl von Phasen der Zusammensetzung AE bzw.…”
Section: Introductionunclassified
“…Im Rahmen unserer Untersuchungen u È ber lo È sliche Zintl-Ionen der Gruppe 14 [3,9,26,27] interessieren wir uns auch fu È r die von uns zu Auflo È sungszwecken eingesetzten, erstarrten Schmelzen der nominellen Zusammensetzung ¹K 4 Sn 9 ª und ¹K 3 Sn 9 ª. Die bei mehreren 100°C aus den Elementen hergestellten Schmelzkuchen lo È sen sich nahezu ru È ckstandsfrei in Ethylendiamin.…”
Section: Introductionunclassified