Article

Increasing nuclearity of secondary building units in porous cobalt(II) metal-organic frameworks: variation in structure and H2 adsorption.

School of Chemistry, University of Nottingham, University Park, UK NG7 2RD.
Dalton Transactions (impact factor: 3.84). 12/2011; 40(45):12342-9. DOI:10.1039/c1dt10901d pp.12342-9
Source: PubMed

ABSTRACT Reaction of Co(NO(3))(2)·6H(2)O with H(2)L [H(2)L = pyridine-4-(phenyl-3',5'-dicarboxylic acid)] under different reaction conditions gives three closely-related metal-organic framework polymers, {[Co(2)(L)(2)(DMF)]·n(solv)}(∞) (1), {[Co(L)]·2DMF}(∞) (2) and {[Co(3)(L)(3)(DMF)(0.5)(H(2)O)(1.5)]·n(solv)}(∞) (3). Variation in reaction conditions thus has a decisive impact on the materials isolated, producing frameworks based upon either binuclear (1, 2) or trinuclear (3) cobalt cluster nodes. Analysis of their crystal structures shows that all three contain considerable solvent-accessible volumes, an indication of porosity that is confirmed for desolvated 1 and 3, which can store up to 2.75 and 2.33 wt% of H(2) at 78 K and 20 bar, respectively.

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Keywords

binuclear
 
closely-related metal-organic framework polymers
 
considerable solvent-accessible volumes
 
crystal structures
 
different reaction conditions
 
porosity
 
reaction conditions
 
trinuclear