Dear Maolong,

Please see follow papers:

1. Masoud Mirzaei , V. Lippolis , Hossein Eshtiagh Hosseini , milad mahjoobizadeh , Decaaquabis(μ3-4-hydroxypyridine-2,6-dicarboxylato)bis(4-hydroxypyridine-2,6-dicarboxylato)tetramanganese(II) 3.34-hydrate: a new three-dimensional open metal-organic framework based on a tetranuclear MnII complex of chelidamic acid and undecameric stitching water clusters , Acta Crystallographica Section C: Structural Chemistry , Volume ( 68 ) , 2011-12, Pages 7-11.

2. Masoud Mirzaei Shahrabi , H. Aghabozorg , Hossein Eshtiagh Hosseini , A Brief Review on Structural Concepts of Novel Supramolecular Proton Transfer Compounds and Their Metal Complexes Part(II) , Journal of the Iranian Chemical Society , Volume ( 8 ) , 2011-4, Pages 580-607.

For further papers on di-carboxylic acid transition metal complexes go to this link:

http://mirzaeesh.profcms.um.ac.ir/index.php?option=com_content&view=article&id=7707&Itemid=20885

 Dear Maolong

Please go to the following link

http://www.sciencedirect.com/science/article/pii/S0020169315004089

Dear Masoud Mirzaei,

Thank you for your kind reply and suggestion. Thank you very much. 

I know that the rigid di-carboxylic acids are one type of efficient ligands to construct porous MOFs with kinds of applications. When involving lanthanide metal ions, only few porous and stable MOFs were reported. In fact, I want to know whether the conbination of flexible tetra-carboxylic acid with rigid dicarboxylic acid may helpful to find more novel, porous and stable lanthanide MOFs.

Mr. Chen,

Generally functionalized - COOH containing organics are among the prominent templates for ligands