S. Ayyappan et al., SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF A CHIRAL OPEN-FRAMEWORK TIN(II) PHOSPHATE, [CN3H6][SN4P3O12] (GUAN-SNPO), Chemistry of materials, 10(11), 1998, pp. 3308
A chiral open-framework tin phosphate structure, [CN3H6][Sn4P3O12], ha
s been obtained by using an achiral structure-directing agent, guanidi
ne. The structures of both enantiomorphs have been determined: tetrago
nal, space groups P4(3) (No. 78) and P4(1) (No. 76), a = 8.8881(1) Ang
strom, c = 20.6029(4) Angstrom, V = 1627.59 (4) Angstrom(3), Z = 4, M
= 819.76. The framework, which is composed of puckered 6-membered (Sn3
P3O6) and 12-membered (Sn6P6O12) rings, accommodates the organic catio
n in a tortuous chiral channel.