Effect of Counteranions in Self-Assembled Silver(I)-Coordination Polymers of 4-Aminobenzonitrile

Four homoleptic coordination polymers of general composition
[Ag­(4ABN)4/2]­X (4ABN ≡ 4-aminobenzonitrile) were
synthesized
and characterized by X-ray single crystal structure analysis. For
X = NO3– (P21/n, Z = 4; 1), PF6– (P21/n, Z = 4; 2), and ClO4– (P21/n, Z = 4; 3), similar topologies
with undulated layers (63 nets) are found, which are separated
by the anions. For X = SO3CF3– (P1̅, Z = 2; 4), a one-dimensional structural fragment with polymeric double-bridged
cationic chains again separated by the anions is formed. It is rationalized
that different dimensionalities
of the polymeric structural fragments depend upon the size of the
separating counteranions. This simple rule can also be applied for
already known ∞2[Ag­(4ABN)4/2]­BF4.