Decomposition studies of group 6 hexacarbonyl complexes. Part 1: Production and decomposition of Mo(CO)₆ and W(CO)₆

Abstract

Chemical studies of superheavy elements require fast and efficient techniques, due to short half-lives and low production rates of the investigated nuclides. Here, we advocate for using a tubular flow reactor for assessing the thermal stability of the Sg carbonyl complexSg(CO) 6 . The experimental setup was tested with Mo and W carbonyl complexes, as their properties are established and supported by theoretical predictions. The suggested approach proved to be effective in discriminating between the thermal stabilities of Mo(CO) 6 and W(CO) 6 . Therefore, an experimental verification of the predicted Sg−CO bond dissociation energy seems to be feasible by apply- Tc carbonyl complex, we estimated the lower reaction time limit for the metal carbonyl synthesis in the gas phase to be more than 100 ms. We examined further the influence of the wall material of the recoil chamber, the carrier gas composition, the gas flow rate, and the pressure on the production yield of 104 Mo(CO) 6 , so that the future stability tests with Sg(CO) 6 can be optimized accordingly.

Chemical studies of elements with Z⩾ 104 in gas phase

“…The decomposition studies were continued for Mo(CO) 6 and W(CO) 6 . The thermal stability of Mo(CO) 6 was investigated in interactions with different column materials and by varying different factors, such as CO concentration and the influence of impurities of O 2 and CO 2 [56]. Figure 13 shows the experimental setup for the decomposition studies performed with fission products at the University of Bern and the obtained results for 104 Mo(CO) 6 [56].…”

“…The thermal stability of Mo(CO) 6 was investigated in interactions with different column materials and by varying different factors, such as CO concentration and the influence of impurities of O 2 and CO 2 [56]. Figure 13 shows the experimental setup for the decomposition studies performed with fission products at the University of Bern and the obtained results for 104 Mo(CO) 6 [56]. The thermal stability of a carbonyl complex is dependent on the column material where the gas-solid interaction takes place (Fig.…”

“…Inside the stainless steel tube there is a quartz column (9), used as a casing for metal foils inserts (10), which form thereby a metal column. All the connectors are based on Swagelok ® parts for He tight hermetic sealing [56]. [15] with the adsorption enthalpies given in the text.…”

“…104 Mo(CO)6 decomposition curves on different metal surfaces as a function of column temperature[56].…”

Microstructure and Mechanical Properties of Annealed WC/C PECVD Coatings Deposited Using Hexacarbonyl of W with Different Gases

“…The PECVD method involves using Ar to create low-pressure and low-temperature plasma, which enables the deposition of a coating in temperatures up to 500 • C, where W hexacarbonyl [21][22][23][24] has been used as a precursor. Usoltsev et al [25] explored the process of creation and decomposition of W(CO) 6 and Mo(CO) 6 . Rezuchina and Švyrev [26] and Garner et al [27] researched the pressure of saturated gases and their sublimation temperatures.…”