Superior Adsorbents for Aerospace Applications

University of Houston • University of Houston-Clear Lake • ISSO Annual Report Y2006 • 46-47

Jack Y. Lu

ABSTRACT—Superior adsorbents have been important topics in current chemical and materials research because they have been found to have a wide range of applications. Research on adsorbents focuses on the rational design and synthesis of new materials that can be used for space applications. The development of a new two-dimensional coordination polymer indicates the potential of UHCL laboratories.

Synthesis of functional materials represents one of the current challenges in chemical research. The metal-organic polymers have been found to have a wide range of applications such as molecular separation and pollution prevention in air, liquid and water systems, where they can be used as ion exchangers and molecular sieves. The objective of the proposal is a design and synthesis of new superior adsorbents that can be used to protect aerospace personnel from unhealthy environments.

Experimental Activity, Results and Discussion
Among the polymeric materials synthesized in our laboratory, [Cd(NA)₂],¹ a new two-dimensional coordination polymer, has been synthesized under hydrothermal reaction conditions. The two-dimensional networks (Fig. 1) show a paired stacking arrangement and define how 2-D networks are stabilized via interdigitation and p-p interactions.

[Cu(BPY)(NO₃)₂]_n was reacted with additional 4,4'-bipy, resulting in a new self-assembled metal-organic network structure featuring the first two-fold interpenetrating 3-D 4².8⁴ network structure:

{[Cu(BPY)₂(H₂O)₂][Cu(BPY)₂(H₂O)(NO₃)]}(NO₃)_{3 •}12H₂O. ²

The two independent 3-D networks in this compound, when minimally interpenetrating, enable this 3-D open-channel structure to accommodate a large amount of water molecules and nitrate anions. Such inclusion phenomena in interpenetrating open-frameworks are very suggestive of practical applications, especially in those open-channel structures with minimum interpenetrating frameworks (Fig.2).

Figure. 1. Non-perspective view of a section of the 2-D plane of the structure.

Figure 2. View of the 3-D open-framework linkages in complex 2. The “bending” part of the square-grid is differentiated from copper atoms dispersed throughout the model.

References
¹J. Y. Lu, M. A. Achten, and A. Zhang, "A 2-D Cadmium-Centered Polymer and Its Isomers," Inorg. Chem. Commun. 10 (2006): 114-16 (In press.)
²J. Y Lu, A. A. Fernandez, Zh. Ge, and K. A. Abboud, "A Novel Two-Fold Interpenetrating 3-D 42.84 Network Self-Assembled from a New 1-D Coordination Polymer," New J. Chem. 29 (2005): 434-38.

Publications
Lu, J. Y, A. A. Fernandez, Zh. Ge, and K. A. Abboud. "A Novel Two-Fold Interpenetrating 3-D 42.84 Network Self-Assembled from a New 1-D Coordination Polymer," New J. Chem. 29 (2005): 434-38.
Lu, J. Y. and Zh. Ge. "Synthesis and Structures of Two New Metal-Organic Polymers Containing Imidazoldicarboxylate Ligands for Hydrogen Bonding Networks, One with a Covalent Pleated Sheet Conformation," Inorg. Chim. Acta, 358 (2005): 828-33.
Lu, J. Y. and Chen, L. "The First Bromonicotinato-Coordinated Metal-Organic Polymer Featuring Covalent 2-D Layer Alternately Sandwiched by 1-D Intra-Hydrogen Bonding Networks," Inorg. Chem. Commun. 7 (2004) 350-54.
Lu, J. Y. "Crystal Engineering of Cu-Containing Metal-Organic Coordination Polymers Under Hydrothermal Conditions," Coord. Chem. Rev. 246 (2003): 345-65.
Lu, J. Y. and Babb, A. M. "A Unique Eclipsed 2-D Coordination Polymer with Removable Iodine Molecules in the Open-Channel Structure," Chem. Commun. (2003): 1346-47.
Lu, J. Y. and V. E. J. Schauss. "A Novel Nanostructured Open-Channel Coordination Polymer with an Included Fused-Polyiodide Ring," Inorg. Chem. (2002): 1945-48.
Lu, J. Y. and E. E. Kohler. "A Non-Interpenetrating 3-D Coordination Polymer Built From Binuclear Cd Units Elaborated With Square-Pyramidal Geometry of Cadmium," Inorg. Chem. Commun. 5 (2002) 196-99.
Lu, J. Y. and A. M. Babb. "A Simultaneous Reduction, Substitution and Self-Assembly Reaction Under Hydrothermal Conditions Afforded the First Diiodopyridine Copper(I) Coordination Polymer," Inorg. Chem. 41 (2002) 1339-41.
Lu, J. Y. and A. M. Babb. "An Extremely Stable Open-Framework Metal-Organic Polymer With Expandable Structure and Selective Adsorption Capability," Chem. Commun. 13 (2002): 1340-41.
Lu, J. Y. and A. M. Babb. "An Unprecedented Interpenetrating Structure with Two Covalent-Bonded Open-Framework of Different Dimensionality," Chem. Commun. (2001) 821-22.
Lu, J. Y, C. Norman, K. A. Abboud, and A. Ison. "Crystal Engineering of An Inclusion Coordination Polymer with Cationic Pocket-Like Structure and Its Property to Form Metal-Organic Nanofibers," Inorg. Chem. Commun. 4 (2001) 459-62.
Lu, J. Y. and A. M. Babb. "The First Triple-Layer 2-D Coordination Polymer: [Cu₃(bpen)(IN)₆(H₂O)₂]," Inorg. Chem. 40 (2001): 3261-63.
Lu, J. Y. and A. M. Babb. "Self-Assembly of Two-Dimensional Coordination Polymers with Rigid and Flexible Building Blocks," Inorg. Chim. Acta 318 (2001) 186.
Lu, J. Y., K. A. Runnels, and C. Norman. "A New Metal-Organic Polymer with Large Grid Acentric Structure Created by Unbalanced Inclusion Species and Its Electrospun Nanofibers," Inorg. Chem. 40 (2001) 4516-18.

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