The effect of solvent type on the infrared spectrum of carbon monoxide adsorbed at platinum electrodes

Three 2D coordination polymers, [Cu2(µ4-dpa)(bipy)2(H2O)]n∙6nH2O (1), [Mn2(µ6-dpa)(bipy)2]n (2), and [Zn2(µ4-dpa)(bipy)2(H2O)2]n·2nH2O (3), were prepared by a hydrothermal method using metal(II) chloride salts, 3-(2′,4′-dicarboxylphenoxy)phthalic acid (H4dpa) as a linker, as well as 2,2′-bipyridine (bipy) as a crystallization mediator. Compounds 1–3 were obtained as crystalline solids and fully characterized. The structures of 1–3 were established by single-crystal X-ray diffraction, revealing 2D metal-organic networks of sql, 3,6L66, and hcb topological types. Thermal stability and catalytic behavior of 1–3 were also studied. In particular, zinc(II) coordination polymer 3 functions as a highly active and recoverable heterogeneous catalyst in the mild cyanosilylation of benzaldehydes with trimethylsilyl cyanide to give cyanohydrin derivatives. The influence of various parameters was investigated, including a time of reaction, a loading of catalyst and its recycling, an effect of solvent type, and a substrate scope. As a result, up to 93% product yields were attained in a catalyst recoverable and reusable system when exploring 4-nitrobenzaldehyde as a model substrate. This study contributes to widening the types of multifunctional polycarboxylic acid linkers for the design of novel coordination polymers with notable applications in heterogeneous catalysis.

Download Full-text

Infrared Spectrum of Carbon Monoxide Chemisorbed on Evaporated Nickel Films

The Journal of Physical Chemistry ◽

10.1021/j100888a017 ◽

1965 ◽

Vol 69 (4) ◽

pp. 1195-1203 ◽

Cited By ~ 33

Author(s):

C. W. Garland ◽

R. C. Lord ◽

P. F. Troiano

Keyword(s):

Carbon Monoxide ◽

Infrared Spectrum ◽

Nickel Films

Download Full-text

Influence of chemisorbed carbon monoxide on hydrogen evolution at smooth platinum electrodes in sulfuric acid solution

Journal of Electroanalytical Chemistry ◽

10.1016/s0022-0728(80)80494-3 ◽

1980 ◽

Vol 115 (1) ◽

pp. 45-51 ◽

Cited By ~ 6

Author(s):

M.W. Breiter

Keyword(s):

Carbon Monoxide ◽

Sulfuric Acid ◽

Acid Solution ◽

Hydrogen Evolution ◽

Sulfuric Acid Solution ◽

Platinum Electrodes

Download Full-text

Investigation of the Role of Carbonylchemistry to Pattern Platinum Electrodes

MRS Proceedings ◽

10.1557/proc-688-c5.6.1 ◽

2001 ◽

Vol 688 ◽

Author(s):

St. Schneider ◽

H. Kohlstedt ◽

R. Waser

Keyword(s):

Carbon Monoxide ◽

Etch Rate ◽

Noble Metals ◽

Electrode Materials ◽

In Situ Monitoring ◽

Platinum Electrodes ◽

Process Chemistry ◽

Dimension Control ◽

Axis Position

AbstractNoble metals like platinum or irdium are used as electrode materials in DRAM or FRAM devices. Their etch process is a challenge as conventional, sputter driven etch processes either result in redeposition problems (fences) or in a severe sloping (loss of dimension control) and are not acceptable for high density integration architectures. The high temperature etch regime offers a solution by increasing the chemical etch component and thus the volatility of the etch products.As previously reported, the platinum etch rate increases exponentially for a chlorine etch process with increasing wafer temperature. In this study we investigate the particular role of carbon monoxide in a Cl2/CO etch process. We find that carbon monoxide additions to a chlorine process boost the chemical component of the platinum etch rate very significantly, exceeding the effects in the chlorine only process regime by far. Additionally we compare these results with a Cl2/O2 and a Cl2/CO2 process chemistry, which are not found to be particularly beneficial.To better understand the etch process we use an energy dispersive quadrupole mass spectrometer for in situ monitoring, attached to the chamber at two different locations. We are able to position the probe orifice at the place of the wafer electrode, to record ion energy and ion mass spectra of species impinging on the wafer plane. A second off axis position allows for etch product monitoring.

Download Full-text