ISSN:
0044-2313
Keywords:
Palladium Complexes
;
Platinum Complexes
;
Crown Ether Complexes
;
Hexachlorodipalladate(II)
;
Hexachlorodiplatinate(II)
;
X-ray Structures
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Synthesis and Structure of Crown Ether Complexes of Potassium Hexachlorodipalladate(II) and -diplatinate(II)K2[MCl4] (M = Pd, Pt) reacts with an excess of crown ether 18-crown-6 in water to give the crown ether complexes of potassium hexachlorodipalladate(II) and -diplatinate(II) [K(18-cr-6)]2[M2Cl6] (M = Pd, 1; M = Pt, 3), respectively, and in methylene chloride to give those of potassium tetrachloropalladate(II) and -platinate(II) [K(18-cr-6)]2[MCl4] (1) (M = Pd, 2; M = Pt, 4), respectively. 1-4 are characterized by microanalysis, NMR (1H, 13C), and vibrational spectroscopy. The X-ray structure analyses of the isotypic complexes 1 (P21/c; a = 10,9678(8), b = 8,2991(7), c = 22,469(2) Å, β = 98,523(5)°; Z = 2) and 3 (P21/c; a = 10,934(3), b = 8.376(3), c = 22,410(5) Å, β = 98,77(3)°; Z = 2) reveal [M2Cl6]2- anions of nearly D2h symmetry and [K(18-cr-6)]+ cations, in which the distance of K+ to the mean plane of the crown ether defined by its six oxygen atoms amounts to 0,830(4) Å in 1 and 0,821(2) Å in 3, respectively. There are tight contacts between cations and anions (d(K-Cl): 3,341(2)/3,260(2) Å (1); 3,348(4)/3,259(4) Å (3)).
Notes:
K2[MCl4] (M = Pd, Pt) reagiert mit überschüssigem Kronenether 18-Krone-6 in Wasser zu den Kronenetherkomplexen von Kaliumhexachlorodipalladat(II) bzw. -diplatinat(II) [K(18-cr-6)]2[M2Cl6] (M = Pd, 1; M = Pt, 3) und in Methylenchlorid zu denen von Kaliumtetrachloropalladat(II) bzw. -platinat(II) [K(18-cr-6)]2[MCl4] (M = Pd, 2; M = Pt, 4). 1-4 sind durch Elementaranalyse sowie NMR-(1H, 13C) und schwingungsspektroskopisch charakterisiert. Die Röntgeneinkristallstrukturanalysen der beiden isotypen Komplexe 1 (P21/c; a = 10,9678(8), b = 8,2991(7), c = 22,469(2) Å, β = 98,523(5)°; Z = 2) und 3 (P21/c; a = 10,934(3), b = 8,376(3), c = 22,410(5) Å, β = 98,77(3)°; Z = 2) zeigen [M2Cl6]2--Anionen von nahezu D2h-Symmetrie und [K(18-cr-6)]+-Kationen, in denen K+ in 1 um 0,830(1) Å bzw. in 3 um 0,821(2) Å aus der durch die sechs Sauerstoffatome des Kronenethers definierten Ebene ausgelenkt ist. Zwischen Kationen und Anionen bestehen enge Kontakte (d(K—Cl): 3,341(2)/3,260(2) Å (1); 3,348(4)/3,259(4) Å (3)).
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19976231028
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