Metal organic polymers

The molecular weight (M , GPO with polystyrene standard) is in the range of 8-14 kD (P 10-30). The M values for the metal-organic polymers are generally lower compared to that of the metal-free organic polymer (Pq). The authors therefore came to the conclusion that the Re-bipyridine monomer 58 is less reactive in the Pd-catalyzed cross-coupling reaction compared to the biphenyl monomer 59. These polymers have also been characterized by and NMR, as well as by FTIR spectroscopy. 

The metal-organic polymers (Piq, P25> P50) show two spectrally distinct absorption bands, one due to the absorption (Anax=400 nm) of the polymer... 

Andrianov, K. A., Metal-Organic Polymers. Interscience, New York, 1965. 

Andrianov K.A., Metal-organic polymers. John Wiley Sons, New York, London, Sydney, 1965. 

Figure 9.1 Schematic representation of some of the simple network architectures structurally characterised for metal-organic polymers (a) 2D honeycomb, (b) ID ladder, (c) 3D octahedral, (d) 3D hexagonal diamondoid, (e) 2D square grid, and (f) ID zigzag chain (reprinted from Section Key Reference The American Chemical Society).

Several metal-organic polymers assembled by dithioether ligands, which are functionalized by heteroelements such as O, N, or Si in the spacer unit, have been recently described and reacted with Cu(I) salts. For example, the 2D square-grid coordination polymer 37 incorporating the 16-membered dithiaoxa crown-ether L37 has been prepared by a self-assembly process involving the interaction of the dithiaoxa macrocycle with CuCN (Scheme 17) the parallel reaction of the dithiaoxa crown-ether with Cul afforded the ID double-stranded coordination polymer 37 . This example demonstrates, how the nature of the counterion can control the form of the network.157... 

Fig. 9 Metal-organic polymers made by N-heterocyclic carbenes...

Self-assembly of two or more complementary components, a node and spacer, or modular self-assembly . The molecular recognition features are present in two or more complementary molecules (e.g. cocrystals) or ions (e.g. salts or metal-organic polymers). 

Metal-organic polymers offer considerable potential in the context of molecular magnetism, semiconductors, and conductors.81... 

W. Chen, J.Y. Wang, C. Chen, Q. Yue, H.M. Yuan, J.S. Chen, and S.N. Wang, Photo-luminescent Metal-organic Polymer Constructed from Trimetallic Clusters and Mixed... 

Scheme 9.10 Supramolecular metal-organic polymer 17 for the heterogeneous catalysis of asymmetric hydrogenations.

Another potential source of processlble precursors Is the citric acid/ethylene glycol system which has been esiployed previously in the preparation of highly dispersed perovskite, spinel and related complex oxides. This method provides soluble, metal-organic, polymer precursors which have been used for the fabrication of oxide thin films as well as for the production of oxide powders with excellent homogeneity, good stoichiometry control and uniform sizes at relatively low temperatures(13,14). 

Compared to traditional materials, especially metals, organic polymers show high sensitivity to temperature [1-3]. Most importantly, they exhibit very low softening points, which is attributed to the intrinsic flexibility of their molecular chains. Thus, whereas most metals do not soften appreciably below their melting points, which maybe 1000°C or higher, many polymers commonly used as plastics such as polyethylene, polystyrene, and poly( vinyl chloride), soften sufficiently by about 100°C to be of no use in any load-bearing applications. 

Metal organic polymer compounds containing Cd + and Zn + ions were found to possess photo-luminescent properties [26,27]. 

Mahmoudi G, Morsali A. Crystal-to-crystal transformation an Hgll metal-organic polymer constructed with a triazole ligand. Z Anorg Allg Chem 2009 2697-700. 

It is known that the synthesis of desirable metal-organic polymers is one of the most important factors for the success of the fabrication of metal-organic nanofibers [29]. Among several novel microporous metal-organic pol5miers, only a few of them have been fabricated into metal-organic fibers. 

Lu, J. Y Runnels, K. A. Norman, C. A new metal-organic polymer with large grid acentric structure created by unbalanced inclusion species and its electrospun nanofibers. Inorgan. Chem., 2001, 40,4516-4517. 

Metal-organic polymer gel impregnated with organic monomer... 

A major challenge that exists in the preparation of pyrrole- and thiophene-based pendant metal-organic polymers is the strong absorption in the visible re-... 

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