Structural and Near-IR Luminescent Properties of Erbium-Containing Coordination Polymers

The near-IR luminescence properties of two Er-III-containing coordination polymers, namely, [Er(btc)(H2O)(5)center dot 3.5H(2)O](x) [(btc)(3-) = 1,3,5-benzenetricarboxylate] and [Er-2(bdc)(3)-(H2O)(4)](x) [(bdc)(2-) = 1,4-benzenedicarboxylate] were investigated with the aim of testing their potential use as optical materials Because both present relatively small quantum yields and short excited-state lifetimes, factors Influencing their luminescent properties were deciphered ill an effort to Improve their luminescent properties Thus, three other families of compounds were also investigated. (i) the two corresponding dehydrated compounds with respective chemical formula [Er(btc)] and [Er-2(bdc)(3)](x) for evaluating the importance of O-H vibrators, (ii) the heterodinuclear compounds [Er2-2xY2x(bdc)(3)(H2O)(4)](infinity) (x = 0.2, 0.5, 0.8 and 0.9) for estimating the role of intermetallic quenching and (iii) the heterodinuclear compounds [Er2-2xYb2x(bdc)(3)(H2O)(4)](x) (x = 0.2 and 0.5) for checking whether Yb-III-sensitized up-conversion can be induced or not ((C) Wiley-VCH Verlag GmbH & Co KGaA, 69451 Weinheim, Germany, 2009)