Electronic properties of thin SiO2 films deposited at low temperatures by new ECR microwave PECVD process

The unusual electronic properties and unique reactivity of fulvenes have interested researchers for over a century. The propensity to form dipolar structures at relatively low temperatures and to participate as various components in cycloaddition reactions, often highly selectively, makes them ideal for the synthesis of complex polycyclic carbon scaffolds. As a result, fulvene cycloaddition chemistry has been employed extensively for the synthesis of natural products. More recently, fulvene cycloaddition chemistry has also found application to other areas including materials chemistry and dynamic combinatorial chemistry. This highlight article discusses the unusual properties of fulvenes and their varied cycloaddition chemistry, focussing on applications in organic and natural synthesis, dynamic combinatorial chemistry and materials chemistry, including dynamers, hydrogels and charge transfer complexes. Tables providing comprehensive directories of fulvene cycloaddition chemistry are provided, including fulvene intramolecular and intermolecular cycloadditions complete with reactant partners and their resulting cyclic adducts, which provide a useful reference source for synthetic chemists working with fulvenes and complex polycyclic scaffolds.

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High quality, high deposition rate SiO2 films at low temperatures using silicon fluorides and plasma assisted deposition techniques

Journal of Vacuum Science & Technology A Vacuum Surfaces and Films ◽

10.1116/1.578673 ◽

1993 ◽

Vol 11 (6) ◽

pp. 2945-2949 ◽

Cited By ~ 8

Author(s):

C. Falcony ◽

J. C. Alonso ◽

A. Ortiz ◽

M. Garcia ◽

E. P. Zironi ◽

...

Keyword(s):

Deposition Rate ◽

Low Temperatures ◽

High Deposition Rate ◽

High Quality ◽

Sio2 Films ◽

Deposition Techniques

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Structural, Magnetic and Mössbauer Studies of Bis(2,6-bis(pyrazol-3-yl)pyridine)iron(II) Triflate and its Hydrates

Australian Journal of Chemistry ◽

10.1071/c96206 ◽

1997 ◽

Vol 50 (9) ◽

pp. 869 ◽

Cited By ~ 43

Author(s):

Kristian H. Sugiyarto ◽

Karyn Weitzner ◽

Donald C. Craig ◽

Harold A. Goodwin

Keyword(s):

Electronic Properties ◽

Low Temperatures ◽

Room Temperature ◽

Spin Transition ◽

Water Molecules ◽

Triclinic Space Group ◽

Discontinuous Transition ◽

A Minor ◽

Spin Species ◽

Anhydrous Complex

The electronic properties of bis(2,6-bis(pyrazol-3-yl)pyridine)iron(II) triflate depend markedly on the extent of hydration. The trihydrate is low spin while the monohydrate is high spin at room temperature but undergoes a discontinuous transition to low spin at low temperatures. In the anhydrous complex magnetic and Mössbauer spectral data indicate that there is a minor fraction of low-spin species at room temperature and this fraction increases at low temperatures. The spin transition in the anhydrous salt is continuous and incomplete at 80 K. The structure of the trihydrate reveals an extensive hydrogen-bonding network which involves the uncoordinated >NH groups of the pyrazolyl groups in the ligands, the water molecules and the anions. The disruption of this network on loss of water is believed to be responsible for the change in electronic properties. Bis(2,6-bis(pyrazol-3-yl)pyridine)iron(II) triflate trihydrate: triclinic, space group P-1, a 11·490(5), b 12·218(6), c 13·666(6) Å, α 104 ·67(2), β 104·58(2), γ 104·35(2)°, Z 2.

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