Stable homopolyatomic anions. Synthesis and crystal structures of salts containing the pentaplumbide(2-1) and pentastannide(2-1) anions. [Stabilized by complexation with 2,2,2-crypt]
The synthesis and crystal structure are reported for two salts in which the pentaplumbide(2--) (I) and pentastannide(2--) (II) anions have been stabilized as a result of complexation of the sodium cations by 4, 7, 13, 16, 21, 24-hexaoxa-1, 10-diazobicyclo(8.8.8)hexacosane (2,2,2-crypt). The phases are prepared by the reaction of solutions of crypt in ethylenediamine with the intermetallic compositions NaPb/sub 1.7-2/ and NaSn/sub 1--1.7/. The compounds are trigonal and isostructural; for I a = 11.615 (3) A and c = 22.120 (12) A while for II a = 11.620 (1) A and c = 22.160 (7) A, the data applying at temperatures of approximately 5 and approximately 30/sup 0/C, respectively. The compounds contain the trigonal-bipyramidal homopolyatomic anions Pb/sub 5//sup 2-/(I) and Sn/sub 5//sup 2--/ (II) with substantially D/sub 3h/ symmetry. In Pb/sub 5//sup 2--/ the equatorial-equatorial and axial-equatorial bond distances are 3.238 (4) and 3.002 (3) A, respectively, while in Sn/sub 5//sup 2--/ the corresponding distances are 3.095 (10) and 2.887 (7) plus 2.854 (6) A. crypt complexation of sodium or potassium cations is evidently not sufficient to allow isolation of these derivatives of the Pb/sub 9//sup 4--/ anion from ethylenediamine or ammonia solvents.
- OSTI ID:
- 7107759
- Journal Information:
- Inorg. Chem.; (United States), Vol. 16:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
LEAD COMPLEXES
CRYSTAL STRUCTURE
SYNTHESIS
TIN COMPLEXES
ANIONS
BOND ANGLE
BOND LENGTHS
HETEROCYCLIC COMPOUNDS
MEDIUM TEMPERATURE
CHARGED PARTICLES
COMPLEXES
IONS
ORGANIC COMPOUNDS
400201* - Chemical & Physicochemical Properties
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)