Crystal structure and luminescence spectra of Eu2（p-MAB）6（PHEN）2 complex

The title complex crystalizes in the space group P1 with a = 1.3349(7), b=1.9790(4), c= 1.2784 (7) nm, α = 97.67(1). β = 10636(1), γ=91.71(1)° ,Z = 2, Mr= 1475.19 and the final R = 0.051. Each asymmetric species in the crystal contains two crystallographically different Eu (p-CH3C6H4COO)3(C12H8N2) units. Two types of bmuclear molecules are formed by the combination of each of the units through inversion with corresponding units of (he closest asymmetric species. The former contains 4 bridged carboxylate groups bonded to the two central europium (III) ions, and the latter, only 2 bridged carboxylate anions Their Eu-Eu atomic distances are 0.4203 and 0.5298 nm respectively. In the 7F0→ 5D0, excitation spectrum of the complex, there are two sharp peaks al 580.07 and 580.73nm. This shows that the complex has two Eu(III) sites. Two different sets of 5D0→Fj (j= 1 - 4) luminescence spectra have been obtained at the selectively excited 5D0 levels of the complex, which indicates that Eu(III) ions in the co