We thank participants of 5th International Symposium on Organometallic Chemistry “STRONG LINKS VIA WEAK INTERACTIONS” for their interesting reports.
Archive for January 26, 2016
Yu. Kondratev, A. Butlak, I. Kazakov, A. Timoshkin
“Sublimation and thermal decomposition of ammonia borane: Competitive processes controlled by pressure”
Thermochim. Acta, 2015, in press
Thermal behavior of ammonia borane BH3NH3 (AB) has been studied by calorimetry, tensimetry and mass spectrometry methods. It is shown, that depending on vapor pressure in the system two competitive processes are taking place at 357 K. At atmospheric pressure thermal decomposition with hydrogen evolution is the dominant process: BH3NH3(s) = 1/n (BH2NH2)n(s) + H2(g) (1). At low pressures (circa 4 mTorr) the major process is endothermic sublimation of AB: BH3NH3(s) = BH3NH3(g) (2). At intermediate pressures both processes occur simultaneously. Enthalpies for the processes (1) and (2) have been determined by drop-calorimetry method: Δ(1)H357° = −24.8 ± 2.3 kJ mol−1 and ΔsubH357°(BH3NH3) = 76.3 ± 3.0 kJ mol−1. Solid products after sublimation and decomposition have been characterized by IR and NMR spectroscopy; gaseous forms were studied by mass spectrometry. Activation energy of 94 ± 11 kJ mol−1 for the process (1) in range 327–351 K was determined by static tensimetry method. Based on the analysis of available thermodynamic characteristics, new values for the standard formation enthalpy of solid AB −133.4 ± 5.2 kJ mol−1 and polyamidoborane −156.7 ± 5.8 kJ mol−1 are recommended.
5th International Symposium on Organometallic Chemistry “STRONG LINKS VIA WEAK INTERACTIONS”. The seminar will take place on January 26th at 11:30 in the audience 1093 at the Institute of Chemistry.
|11:30—12:00 Kari Rissanen
“Self-Assembly of Large Metallosupramolecular Complexes” (University of Jyväskylä, Finland)
|12:00—12:20 Armando J. L. Pombeiro “Resonance-Assisted Hydrogen Bonding as a Synthetic Tool” (Instituto Superior Técnico, Lisbon, Portugal, and RSF International Laboratory on Organometallic Chemistry, Saint Petersburg State University)|
|12:40—13:10 Matti Haukka “Dihalogens as Halogen Bond Donors” (University of Jyväskylä, Finland)|
|13:10—13:30 M. Fatima Guedes da Silva “Hydrogen Bonding in Water Containing Metal Coordination Compounds” (Instituto Superior Técnico, Lisbon, Portugal, and RSF International Laboratory on Organometallic Chemistry, Saint Petersburg State University)|
A.A. Beljaev, D.V. Krupenya, E.V. Grachova, V.V. Gurzhiy, A.S. Melnikov, P.Yu. Serdobintsev, E.S. Sinitsyna, E.G. Vlakh, T.B. Tennikova, S.P. Tunik
“Supramolecular AuI-CuI complexes as new luminescent labels for covalent bioconjugation”
Bioconjugate Chem., 2015
Two new supramolecular organometallic complexes, namely, [Au6Cu2(C2C6H4CHO)6(PPh2C6H4PPh2)3](PF6)2 and [Au6Cu2(C2C6H4NCS)6(PPh2C6H4PPh2)3](PF6)2, with highly reactive aldehyde and isothiocyanate groups have been synthesized and characterized using X-ray crystallography, ESI mass spectrometry, and NMR spectroscopy. The compounds obtained demonstrated bright emission in solution with the excited-state lifetime in microsecond domain both under single- and two-photon excitation. The luminescent complexes were found to be suitable for bioconjugation in aqueous media. In particular, they are able to form the covalent conjugates with proteins of different molecular size (soybean trypsin inhibitor, human serum albumin, rabbit anti-HSA antibodies). The conjugates demonstrated a high level of the phosphorescent emission from the covalently bound label, excellent solubility, and high stability in physiological media. The highest quantum yield, storage stability, and luminance were detected for bioconjugates formed by covalent attachment of the aldehyde-bearing supramolecular AuI–CuI complex. The measured biological activity of one of the labeled model proteins clearly showed that introduced label did not prevent the biorecognition and specific protein–protein complex formation that was extremely important for the application of the conjugates in biomolecular detection and imaging.
Total in December 1778 service applications were carried out.
All together measured:
- 1720 1H spectra
- 285 13C spectra
- 175 DEPT spectra
- 20 COSY spectra
- 19 NOESY spectra
- 75 31P spectra
- 67 19F spectra
196 applications were carried out.