Mixed metal and mixed ligand for tri-nuclear complexes - Research Proposal Example

Mixed Metal and Mixed Ligand for tri-nuclear complexes al Affiliation) A case of Copper(I) and Silver(I) In the coinage metal chemistry, an important role is played by the mixed metal and mixed ligands. It incorporates the coordination of metal ions such as Cu (I), Au (I) and Ag (I). The specific combination leads to the existence of an exo-bidentate mode resulting to the formation of polynuclear complexes. The reaction conditions are great determinants of structures adopted by the coinage metal pyrazolates (Biswas & Ghosh, 2012).

They may take the forms ranging from polymers, hexamers, and tetramers to trimers. The current study focuses on spectroscopic and structural cases involving coinage of metal complexes with specific reference to pyrazolyl ligands. The first case involves trinuclear Au (I) adducts {[3, 5-(CF3)2Pz] Au}3.6 (Bowmaker et al, 2014). Complexes involving synthesis of silver(I) and copper(I) exist exhibiting the structures {[3,5-(CF3)2Pz]Ag}3 and {[3,5-(CF3)2Pz]Cu}3. The resultant effect is a copper complex that has a mixed vallent structure of {[3, 5-(CF3)2Pz]5Cu(II)2Cu(I).

Cu2 dimer becomes available through treatment of {[3,5-(CF3)2Pz]Cu}3 with 2,4,6- collidine which is of an appropriate amount. Bis(pyrazolyl)borate adduct Cu1 is a byproduct that originates from the synthesis of collidine, CuOTf and [H2B(3,5-(CF3)2Pz)2]K (Lalinde et al, 2014)The equivalent related adducts of Silver Ag1 and Ag2 underwent analogous procedures during their preparations. Various methods characterized their differing complexes which include X-ray crystallography. Cu1 and Cu2 have trigonal planar sites of copper (Miyake et al, 2014.

In contrast to the feature, Ag2 consists of Ag(u-N-N)2Ag unit that is found in half-boat conformation. The intermolecular distance between the Ag***Ag molecules is 3.5618A. Other crystals exist which feature Ag2 molecules comprising of flattened and boat chair conformations (Béziau et al, 2013). It becomes important to observe that bis(pyrazolyl)borato components and complexes such as Ag1 are rare due to their ease of decomposition on silver metal (Zhou et al, 2014). Therefore, unique photophysical properties are highlighted for the mononuclear and dinuclear silver(I) and copper(I) complexes.

ReferencesBiswas, S., Saha, R., & Ghosh, A. (2012). Copper (II)–Mercury (II) Heterometallic Complexes Derived from a Salen-Type Ligand: A New Coordination Mode of the Old Schiff Base Ligand. Organometallics, 31(10), 3844-3850.Bowmaker, G. A., Hanna, J. V., King, S. P., Marchetti, F., Pettinari, C., Pizzabiocca, A., . & White, A. H. (2014). Complexes of Copper (I) Thiocyanate with Monodentate Phosphine and Pyridine Ligands and the P (, N)‐Donor Diphenyl (2‐pyridyl) phosphine. European Journal of Inorganic Chemistry, 2014(35), 6104-6116.

Lalinde, E., Moreno, M. T., Ruiz, S., & Sánchez, S. (2014). Attachment of Luminescent Neutral “Pt (pq)(C≡ CtBu)” Units to Di and Tri N-Donor Connecting Ligands: Solution Behavior and Photophysical Properties. Inorganics, 2(4), 565-590.Miyake, R., Nakagawa, Y., & Hase, M. (2014). Selective Thermal Elongation of Metal–Metal Distances in the Two-Dimensional Assembly of Ag (I) Ions Templated by Assembled Peptide Ligands. Crystal Growth & Design, 14(10), 4882-4885.Rizzotto, M. (2012). Metal complexes as antimicrobial agents.

INTECH Open Access Publisher.Zhou, W. L., Liang, J., Qin, C., Shao, K. Z., Wang, F. M., & Su, Z. M. (2014). Syntheses, crystal structures and properties of inorganic–organic hybrids constructed from Keggin-type polyoxometalates and silver coordination compounds. CrystEngComm, 16(32), 7410-7418.Béziau, A., Baudron, S. A., Rogez, G., & Hosseini, M. W. (2015). Assembly, Disassembly, and Reassembly: Conversion of Homometallic Coordination Networks into Mixed Metal–Organic Frameworks. Inorganic chemistry.

Béziau, A., Baudron, S. A., Fluck, A., & Hosseini, M. W. (2013). From Sequential to One-Pot Synthesis of Dipyrrin Based Grid-Type Mixed Metal–Organic Frameworks. Inorganic chemistry, 52(24), 14439-14448.