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Coordination Modulation Method To Prepare New Metal-Organic Framework-Based CO-Releasing Materials

Coordination Modulation Method To Prepare New Metal-Organic Framework-Based CO-Releasing Materials

Francisco J Carmona, Carmen R Maldonado, Shuya Ikemura, Carlos C Romão, Zhehao Huang, Hongyi Xu, Xiaodong Zou, Susumu Kitagawa, Shuhei Furukawa, Elisa Barea

ACS Appl Mater Interfaces. 2018 Sep 19;10(37):31158-31167.

PMID: 30152684

Abstract:

Aluminum-based metal-organic frameworks (MOFs), [Al(OH)(SDC)] n, (H2SDC: 4,4'-stilbenedicarboxylic acid), also known as CYCU-3, were prepared by means of the coordination modulation method to produce materials with different crystal size and morphology. In particular, we screened several reagent concentrations (20-60 mM) and modulator/ligand ratios (0-50), leading to 20 CYCU x_ y materials ( x: reagent concentration, y = modulator/ligand ratio) with different particle size and morphology. Noteworthy, the use of high modulator/ligand ratio gives rise to a new phase of CYCU-3 (CYCU-3' x_50 series), which was structurally analyzed. Afterward, to test the potential of these materials as CO-prodrug carriers, we selected three of them to adsorb the photo- and bioactive CO-releasing molecule (CORM) ALF794 [Mo(CNCMe2CO2H)3(CO)3] (CNCMe2CO2H = 2-isocyano-2-methyl propionic acid): (i) CYCU-3 20_0, particles in the nanometric range; (ii) CYCU-3 50_5, bar-type particles with heterogeneous size, and (iii) CYCU-3' 50_50, a new phase analogous to pristine CYCU-3. The corresponding hybrid materials were fully characterized, revealing that CYCU-3 20_0 with the smallest particle size was not stable under the drug loading conditions. Regarding the other two materials, similar ALF794 loadings were found (0.20 and 0.19 CORM/MOF molar ratios for ALF794@CYCU-3 50_5 and ALF794@CYCU-3' 50_50, respectively). In addition, these hybrid systems behave as CO-releasing materials (CORMAs), retaining the photoactive properties of the pristine CORM in both phosphate saline solution and solid state. Finally, the metal leaching studies in solution confirmed that ALF794@CYCU-3' 50_50 shows a good retention capacity toward the potentially toxic molybdenum fragments (75% of retention after 72 h), which is the lowest value reported for a MOF-based CORMA to date.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1202689448	2,2′-Dinitro-4,4′-stilbenedicarboxylic acid		1202689-44-8	Price

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