Transition metals metal-organic frameworks

In addition, Qian and coworkers reported a luminescent lanthanide-based metal-organic framework (MOF) [Eu(L16)i.5(dmf)]-(DMF)o.5(H20)o.5 (Eu-17, L17vpyridine-3,5-dicarboxylate) with Lewis basic pyridyl sites for the sensing of metal ions (Cu +, Co +, and so on) [40], Under excitation at 321 nm, Eu-17 shows characteristic emission bands of the Eu + ion at 590, 616, and 698 nm, which were ascribed to transitions from the Dq state to " Fi, " F2, and " F4, respectively. The luminescence intensity of Eu-17 was strongly dependent on the identity of the metal ion, with Cu + having the most significant quenching effect. Moreover,... 

Mendt M, Jee B, Stock N et al (2010) Structural phase transitions and thermal hysteresis in the metal-organic framework compound MlL-53 as studied by electron spin resonance spectroscopy. J Phys Chem C 114 19443-19451... 

Remarkably, a large number of electronically conducting intercalation hosts are accessible today, including numerous transition-metal oxides with framework lattices, such as vanadium pentoxide and nickel oxide, and organic solids with molecular lattices. Additionally, a large variety of ionic guest species have been studied. 

Metal organic frameworks (MOFs) are crystalline porous materials whose structure is constituted by metal ions or clusters of metal ions held in places by coordination with bipodal or multipodal rigid organic linkers [1 ]. Typical organic compounds employed for the synthesis of MOFs are aromatic polycarboxylates that coordinate by electrostatic and coordinative bonds with metal ions or metal clusters. The aromatic ring provides conformational rigidity of the linker, making possible the directionality of the interaction of the carboxylic acids with the metallic nodes. There have been reported MOFs for virtually all the transition metals and also for alkali earth and other nontransition metals [5-7]. 

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