Publication Date:
2017-01-18
Description:
The reaction of Pb[CO 3 ] with an aqueous solution of (H 3 O) 2 [B 10 H 10 ] in an equimolar ratio leads to two lead(II) decahydro- closo -decaborate hydrates both as triclinic, pale yellow single crystals. The water-rich compound with the formula [Pb(H 2 O) 3 ] 2 Pb[B 10 H 10 ] 3 · 5.5H 2 O crystallizes in the space group P 1 ( a = 711.72(4), b = 1243.14(8), c = 2064.83(12) pm, α = 81.806(3), β = 83.795(3), γ = 80.909(3)°) with Z = 2. The compound with the lower water content, [Pb(H 2 O) 3 ]Pb[B 10 H 10 ] 2 · 1.5H 2 O, also crystallizes in P 1 ( a = 718.46(4), b = 1288.75(8), c = 1279.91(8) pm, α = 70.145(3), β = 75.976(3), γ = 80.324(3)°) with Z = 2. Both structures can be described as layered arrangements and contain one Pb 2+ cation each, which is only coordinated by the hydridic hydrogen atoms of the hydroborate anions. All the others are primarily surrounded by three water molecules in a non -planar fashion and additional hydrogen atoms of [B 10 H 10 ] 2– anions. The non -lead-bonded crystal water molecules in both structures are all connected via hydrogen bonds to the water molecules, which coordinate the Pb 2+ cations, as well as via non -classical hydrogen bonds to the cluster anions and reside between the layers. The [B 10 H 10 ] 2– anions show only slight distortions from their ideal shape as bicapped square antiprisms.
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
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