Nuclear magnetic double resonance studies of isotopically labelled bis-(dichlorophosphino)methylamine partially oriented in a nematic liquid crystal

Abstract

CH₃N(PCl₂)₂ isotopically labelled with ¹³C or ¹⁵N and oriented in the nematic phase of EBBA has been studied by heteronuclear magnetic double resonance. The derived geometry is similar to that of the fluorine analogue, i.e., the molecular skeleton is planar, with ∠PNP = 117 ± 0.5° and r(PN)= 166.4 ± 1 pm. ¹J(³¹P—¹⁵N) may exhibit significant anisotropy. Components of the shielding tensors for ¹³C, ¹⁵N and ³¹P are also reported.