Table 1 Structure and size of several spheroidal organic ammonium ions.

From: Order–disorder transition of a rigid cage cation embedded in a cubic perovskite

Cationa

TMA+

Abh+

Ath+

Q+

Formula

C4H12N+

C5H10N+

C6H10N+

C7H14N+

Calc. structureb

View full size image

Calc. radius (Å)

2.68

2.75

2.83

2.97

Exp. radius (Å)

2.70

–

2.69

2.77

  1. aTMA+ tetramethylammonium, Abh+ 2-azabicyclo[2.1.1]hexanium, Ath+ 4-azatricyclo[2.2.1.02,6]heptanium, Q+ Quinuclidinium.
  2. bBrown, gray, and pink balls stand for C, N, and H atoms, respectively, and the outer sphere visualizes the ionic radius.
Back to article page