19361-29-6Relevant academic research and scientific papers
Crystal and molecular structure of the trans-hyponitrite compounds Ph 3E(μ-ONNO)EPh3 (E = Ge, Pb)
Mayer, Tobias,Boettcher, Hans-Christian
, p. 1071 - 1074 (2012)
The synthesis of the trans-hyponitrite compounds Ph3E(μ-ONNO) EPh3 [E = Ge (1), Pb (2)] as well as their crystal and molecular structure are reported. Compound 1 crystallized from toluene/pentane in the trigonal space group Rβar{3}$ with a = 29.7969(18), b = 29.7969(18), c = 11.8465(6) A= 120°; V = 9108.8(9) A3; Z = 12, I = 1.461 gA·cm-3,T = 173(2) K. Compound 2 crystallized from toluene/iso-hexane in the triclinic space group Pβar{3}$ with a = 10.0330(2), b = 11.0615(2), c = 24.2080(4) A; α = 97.3730(10), β = 95.8550(10), = 115.3940(10)°; V = 2369.69(7) A3; Z = 3, I = 1.970 ·cm-3, T = 173(2) K.The crystal structure determination revealed that two conformational isomers exist in the row of related group 14 element compounds. Whereas the species of tin and lead exhibit a S-shaped arrangement of the hyponitrite group between the two EPh3 fragments, the corresponding germanium compound shows instead of a N-shape within the hyponitrite group. DFT calculations revealed that S-shaped conformers should be in all three cases the more stable ones. This stands in contrast to the observed N conformation of 1 in the crystal.
