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MOF Linkers with Carboxylic Acid Donor Ligands

  • ascensusspec
  • 9 hours ago
  • 2 min read

Primary building ligands with carboxylic moieties are among the most commonly used ligands for MOF synthesis


The structure and chemo-physical properties of the Metal Organic Frameworks (MOFs) are strongly affected by the nature of metal clusters and organic linkers, which are fundamental to the formation of coordination polymers with multidimensional networks. Given the geometry and chemical properties of multivalent, aromatic carboxylic acids, the materials have proven to be key to the production of high surface area and porous materials.


Structure for Catalog # 08-0175
Catalog # 08-0175

 

 The advantages of carboxylic ligands include commercial availability at a low cost; stability of the framework can be controlled by using metal clusters. A good example is 08-0175, [1,1'-biphenyl]-4,4'-dicarboxylic acid, (BPDC).  BPDC based MOFs generally display ultra high porosity1 and high thermal resistivity [UiO-67, isoreticular MOF of UiO-66

(catalog # 40-1105)]2. BPDC based materials can be used as adsorbents and for catalytic applications.


Structures for Catalog # 08-1220m 08-0195 & 08-1165
Catalog # 08-1220                    Catalog # 08-0195                      Catalog # 08-1165

 

08-1220, Hydroxyl group enriched 2,5-Dihydroxyterephthalic acid (H4DOBDC) based MOFs, with open metal sites (M = Mg, Ni, Co, Mn, Fe, Zn), exhibit desirable adsorption and selectivity features.3 Another modification of a terephthalic acid based ligand is 15-7170,

2-(Diphenylphosphino)terephthalic acid, which contains a metal coordinating diphenylphosphine group. Product 07-1942, 1,4,7,10-tetraazacyclododecane-N,N',N'',N'''-tetraacetic acid (DOTA) contains four carboxylic groups and four nitrogen atoms for coordination.


08-1165, 1,4-Phenylenediacetic acid (H2PDA) has fluorescent properties and could be used for the preparation of photoluminescent MOFs. In addition, the H2PDA ligand has carboxylic groups in the 1,4 position, which allows the molecule to adopt various conformations and accommodate various geometric requirements.4


Other useful products include 08-0195, 1,3,5-Tricarboxybenzene (Trimesic acid, BTC), and 08-0635, 1,3,5-Tris(4-carboxyphenyl)benzene, (H3BTB or simply BTB=benzenetribenzoate). BTC reacts with many metal salts. Given the extended benzene ring structure, BTB based MOFs generally have very high surface areas [e.g. MOF-177 (5250 m2/g].5



Structure for Catalog # 08-0635
Catalog # 08-0635

References:

1.       Ultrahigh Porosity in Metal-Organic Frameworks; Science, 2010, 329, 424.

2.       J. Am. Chem. Soc., 2008, 130, 13850.

3.       J. Am. Chem. Soc., 2012, 134, 14341.

4.       CrystEngComm, 2010, 12, 1509.

5.       J. Mater. Chem., 2007, 17, 3197.

 

Featured Products:

08-0175: [1,1'-Biphenyl]-4,4'-dicarboxylic acid, min. 98%, CAS # 787-70-2 

08-1220: 2,5-Dihydroxyterephthalic acid, 98% H4DOBDC, CAS # 610-92-4

08-1165: 1,4-Phenylenediacetic acid, 97%, CAS # 7325-46-4

08-0195: 1,3,5-Tricarboxybenzene, min. 95% (Trimesic acid) BTC, CAS # 554-95-0

08-0635: 1,3,5-Tris(4-carboxyphenyl)benzene, min. 98% BTB, CAS # 50446-44-1

15-7170: 2-(Diphenylphosphino)terephthalic acid, 98%, CAS # 1537175-69-1 

40-1105: Zirconium 1,4-dicarboxybenzene MOF (UiO-66), CAS # 1072413-80-9

07-1942: 1,4,7,10-Tetraazacyclododecane-N,N',N'',N'''-tetraacetic acid, min. 98% DOTA, CAS # 60239-18-1

 

 


 
 
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