Abstract
A series of group(II) metal 2,2′;6′2″-terpyridine (terpy) complex-based coordination polymers has been synthesized and characterised for their photo-physical and optical properties. Sr(OH2)(terpy)[Au(CN)2]2 forms a 1D chain through bridging [Au(CN)2]− units, with aurophilic interactions (3.1403(6) and 3.468(6)Å) between chains creating a 2D network. Mg(OH2)(terpy)[Pt(CN)4] forms a 1D coordination polymer through bridging [Pt(CN)4]2− linkers, with a 3D structure formed through hydrogen bonds between the unbound N-cyano groups of [Pt(CN)4]2− and the Mg–OH2 units on adjacent chains. M(terpy)[Pt(CN)4] forms an isostructural set for M=Ca, Sr, Ba consisting of a 3D network through bridging [Pt(CN)4]2− linkers. All compounds show terpy-based emission while Sr(OH2)(terpy)[Au(CN)2]2 may also contain aurophilicity-based emission. The materials all show substantial birefringence, with Δn values ranging from 0.31(3) to 0.46(1), the magnitude of which correlates to the orientation of the terpy units relative to the viewing axis of the crystals.
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