A red-emitting Mn(II)-based coordination polymer build on 1,2,4,5-tetrakis(diphenylphosphinyl)benzene

The reaction of Mn(ClO 4 ) 2 ·6H 2 O with 1,2,4,5-tetrakis(diphenylphosphinyl)benzene (L) in DMF affords one-dimensional coordination polymer (CP), [MnL(DMF) 2 ](ClO 4 ) 2 ·DMF, in 87% yield. The cationic chains of the CP are assembled from alternating Mn(II) ions and ligand molecules; each metal ion has a octahedral MnO 6 environment composed of four oxygen atoms from two adjacent ligands and two DMF oxygen atoms. At the temperatures below 200 K, this CP demonstrates a red phosphorescence with λ em max ~660 nm and lifetimes of 1.5–4.5 ms. The EPR study reveals the high-spin state of the Mn(II) ions and the absence of exchange interactions between them. • The reaction of a tetra(phosphine oxide) with Mn(II) salt has been carried out. • Red-emissive 1D coordination polymer, [MnL(DMF) 2 ](ClO 4 ) 2 ·DMF, has been synthesized. • Luminescent and EPR properties of the polymer have been studied.