Electronic properties of novel mixed oxidation-state bis-arene chromium nanowires supported by a mesoporous niobium oxide host

Advanced Materials

Volumn 12, Issue 14, 2000, Pages 1036-1040

  He, Xun ^a,b   Trudeau, Michel ^a   Antonelli, David ^a   Trudeau, M L ^a  

^a UNIVERSITY OF WINDSOR   (Canada)

^b HYDRO QUÉBEC   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

CHROMIUM COMPOUNDS; ELECTRONIC PROPERTIES; NANOSTRUCTURED MATERIALS; NIOBIUM COMPOUNDS; OXIDATION; SEMICONDUCTOR MATERIALS;

SEMICONDUCTING MOLECULAR WIRES;

ELECTRIC WIRE;

EID: 0034230167     PISSN: 09359648     EISSN: None     Source Type: Journal    
DOI: 10.1002/1521-4095(200007)12:14<1036::AID-ADMA1036>3.0.CO;2-Y     Document Type: Article

References (32)

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22. A sample of Nb-TMSl with an HK pore size of 29 A was obtained from Alfa-Aesar and used without further purification. The BrunauerEmmett-Teller (BET) surface area of this material was 673 m2/g and the cumulative pore volume was 0.59 cm3 g"1. The infrared (IR) spectrum showed no evidence of a hydrocarbon C-H stretch. The X-ray diffraction (XRD) pattern for this material showed a peak at d = 38 A. Trimethylsilyl chloride was obtained from Aldrich and distilled over calcium hydride. Nb-TMSl samples were dried at 100 °C overnight under vacuum and then stirred with excess trimethylsilyl chloride in dry ether for 4-6 h under nitrogen. The solvent was then removed in vacuo and the material dried again under vacuum at 100 °C overnight.
23. All elemental analysis was conducted at Galbraith laboratories. The starting material obtained from Alfa-Aesar after treatment with trimethylsilyl chloride gave 53.12 % Nb and 2.57 % C by weight. The material after treatment with 0.07 equivalents of bis-benzene chromium gave values of 51.36 % Nb, 8.30 % C, and 2.02 % Cr.
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32. All EPR spectra were recorded at the temperature of liquid nitrogen on an X-band Bruker ESP 300E Spectrometer equipped with a microwave counter, an nuclear magnetic resonance (NMR) magnetometer and an electromagnet capable of providing a magnetic field range from 50 G to 15 kG. The measurement conditions for the spectra in Figure 2a, b were microwave power 2.03 mW, microwave frequency 9.46 GHz, modulation frequency 100.00 kHz, modulation amplitude 4.821 G, and receiver gain 8.00E+03. The measurement conditions for spectrum in Figure 2d were microwave power l.OOE+1 mW, microwave frequency 9.46 GHz, modulation frequency 100.00 kHz, modulation amplitude 0.962 G, receiver gain 2.00E+04. The powder samples used in the experimental measurements were sealed under vacuum in quartz tubes.