two men indicted for cfc smuggling into u.s
TRANSCRIPT
cal complex about 20 miles from Kobe, near Osaka. A fine chemicals plant there shut down because of water shortages, says a spokesman. But there was little damage at the site. The complex also houses fine chemicals research and environmental health science labs.
Spokesmen for Hoechst, Exxon Chemical, Schering-Plough, and Searle, Monsanto's drug division—all of which have sales offices in Osaka—report their facilities suffered little or no structural damage. And they have accounted for their employees.
George Peaff
Two men indicted for CFC smuggling into U.S. A federal grand jury in Miami has indicted two men for illegally importing 126 tons of chlorofluorocarbons (CFCs) for sale in the U.S.
The case is the largest seizure yet of illegally imported ozone-depleting chemicals, says the U.S. Attorney's Office in Miami. The accused men face up to 20 years in jail and fines of more than $2 million if convicted.
A black market in CFCs has developed as supplies of the soon-to-be-banned chemicals decrease and their prices increase. The federal government set up an interagency task force last year to try to curtail the illegal activity (C&EN, Oct. 31,1994, page 4).
"We've been very concerned for quite a while," says Stephen R. Seidel, director of the Environmental Protection Agency's Stratospheric Protection Division. "This is the first major case, so we are extremely pleased. We anticipate there will be more."
Under the Montreal Protocol on Substances That Deplete the Ozone Layer, industrialized nations must phase out CFC production by Jan. 1, 1996 (stockpiled or recycled CFCs can still be used after that). In the U.S., EPA requires any company that produces or imports the chemicals to have a permit called a consumption allowance. And Congress has imposed an excise tax—cufrently $5.35 per lb—on the sale of ozone-depleting chemicals to encourage users to switch to substitutes.
The Miami indictment charges Adi Dara Dubash and Homi N. Patel with conspiring to violate EPA and Internal Revenue Service regulations. They alleg
edly imported seven shipping containers, each filled with 1,200 cylinders— each cylinder containing 30 lb of CFC-12 (CC12F2)—under the pretext that the chemicals were just passing through the U.S. on the way to Mexico.
"It's perfectly legal to bring CFC-12 into the U.S. without EPA consumption allowances if you are not going to sell it here," notes George H. White II, the Customs Service special agent in Miami who investigated the case. "In this instance, [Dubash and Patel] had all the paperwork completed as if they were going to ship it back out to a foreign company. But when the truck showed up to take the containers out of the bonded facility here in Miami, we followed and found they did not take them to a shipping company."
The Alliance for Responsible Atmospheric Policy, a coalition of CFC users and producers, has urged industry and the public to be suspicious of CFCs offered for sale at prices below the excise tax. "We hope to see more of these indictments so people realize the government is serious," says David J. Stirpe, alliance executive director. "The black market reduces the incentive to shift to alternatives and penalizes legitimate companies who are complying with U.S. laws."
Pamela Zurer
Long, stable acetylenic carbon chains prepared They said it couldn't be done, so Richard J. Lagow did it.
In a paper published last week in Science [267, 362 (1995)], Lagow, a chemistry professor at the University of Texas, Austin, and 10 coworkers reveal how they synthesized and identified a new material consisting of linear chains of 300 to 500 "naked" carbon atoms.
Unlike the carbon atoms in diamond, graphite, or fullerenes, those in Lagow's carbon chains are sp-hybridized, so the chains contain alternating single and triple bonds. Another group reported acetylenic carbon chains of this sort, with as many as 32 carbon atoms, as far back as 1972. But linear chains with hundreds of sp-hybridized carbon atoms were thought to be too unstable to prepare and isolate because of their reactivity.
Lagow stabilizes these long acetylenic chains, whose structure has been confirmed by a variety of techniques, by
capping each end with a trifluoromethyl (CF3), nitrile (C^N), or other group. His results, accumulated over 10 years, indicate the capped chains are surprisingly stable.
The chains also have very useful properties. They are highly soluble in most organic solvents—"a novel feature for any form of carbon," he notes—and thus might be used to make carbon coatings. Because of their triple bonds, the chains pack more electron density than any other form of carbon or known organic compound. So they might be the ultimate in molecular wires for molecular electronic devices. And since they have less thermal stability than graphite or diamond, they might be excellent precursors for diamond synthesis and graphite coatings.
Lagow's team, which includes collaborators at the University of Southern California and Texas A&M University, College Station, prepares linear "sp" carbon by laser vaporization of graphite—the same technique used by some groups to prepare fullerenes. Using a laser to vaporize graphite in the presence of CF3 or C=N radicals in his lab leads to carbon chains capped with CF3
or C=N groups. When these capping radicals are absent, fullerenes such as C60 and C70 form.
The team concludes from its experiments that laser vaporization produces unstable carbon-chain diradical species. When free radicals are present, they cap the carbon-chain species and allow their isolation. But in the absence of capping radicals, the acetylenic chains condense to form fullerenes or particulate material known as fullerene soot.
Lagow (left) and one of his coworkers, graduate student Han-Chao Wei.
JANUARY 23,1995 C&EN 7