Reference

Inhibition of nitrification in soil by acetylenic compounds

Inhibition of nitrification in soil by acetylenic compounds. McCarty, G. W.; Bremner, J. M. (Dep. Agron., Iowa State Univ., Ames, IA 50011, USA). Soil Sci. Soc. Am. J., 50(5), 1198-201 (English) 1986. CODEN: SSSJD4. ISSN: 0361-5995. DOCUMENT TYPE: Journal CA Section: 19 (Fertilizers, Soils, and Plant Nutrition) Section cross-reference(s): 5 Recent work has shown that acetylene [74-86-2] is a potent inhibitor of nitrification in soil. To discover if substituted acetylenes inhibit nitrification in soil, the effects of 17 monosubstituted (HC Y CR) acetylenes (propyne [74-99-7], 1-butyne [107-00-6], 2-ethynylpyridine [1945-84-2], phenylacetylene [536-74-3], 3-butyn-2-one [1423-60-5], 1-phenyl-2-propyn-1-ol [4187-87-5], pentyne [26856-36-0], 4-phenyl-1-butyne [16520-62-0], 5-phenyl-1-pentyne [1823-14-9], 1-ethynylcyclohexylamine [30389-18-5], 2-propyn-1-ol [107-19-7], 2-propyn-1-amine [2450-71-7], 1-hexyne [693-02-7], 3-butyn-1-ol [927-74-2], 1-heptyne [628-71-7], 1-octyne [629-05-0], acetylene monocarboxylic acid [471-25-0]) and of 7 disubstituted (RC Y CR1) acetylenes (2-butyne [503-17-3], 3-phenyl-2-propyn-1-ol [1504-58-1], diphenylacetylene [501-65-5], 2-butyn-1-ol [764-01-2], 2-butyn-1,4-diol [110-65-6], acetylene dicarboxylic acid [142-45-0], 2-butynoic acid [590-93-2]) were studied on prodn. of (NO3- + NO2-)-N in soils treated with (NH4)2SO4. Most of the substituted acetylenes tested inhibited nitrification in soil, and some were potent inhibitors of nitrification. The results with the 4 gaseous compds. tested showed that acetylene, propyne, and 1-butyne inhibited nitrification in soils at partial pressures as low as 0.1 or 1.0 Pa, whereas 2-butyne had little or no effect on nitrification at partial pressures as high as 10 Pa. The data obtained with the 21 nongaseous compds. tested showed that 2-ethynylpyridine, phenylacetylene, and 3-butyn-2-one had the greatest inhibitory effect on nitrification and that acetylene monocarboxylic acid, acetylene dicarboxylic acid, and 2-butynoic acid had the least effect. Studies to measure prodn. of C2H2 in soils treated with the nongaseous compds. showed that the inhibition of nitrification obsd. with these compds. was not due to C2H2 formed by their decompn. in soil. Expts. reported indicate that 2-ethynylpyridine and phenylacetylene compare favorably with nitrapyrin (N-Serve) and etridiazole (Dwell) as soil nitrification inhibitors and have potential practical value for retarding nitrification of fertilizer N in soil.

Synthesis and characterization of ionic polyacetylene derivative with azobenzene moieties

All Rights Reserved. Synthesis and characterization of ionic polyacetylene derivative with azobenzene moieties. Gal, Yeong-Soon; Jin, Sung-Ho; Kim, Sung-Hoon (Polymer Chemistry Laboratory, College of Engineering, Kyungil University, Kyungsan 712-701, S. Korea). Journal of Industrial and Engineering Chemistry (Seoul, Republic of Korea), 12(2), 235-240 (English) 2006 Korean Society of Industrial and Engineering Chemistry. CODEN: JIECFI. ISSN: 1226-086X. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 36 An ionic conjugated polymer with azobenzene moieties was synthesized through the self-activated anionic polymn. of 2-ethynylpyridine with 4-[4-(6-bromohexyloxy)phenylazo]benzonitrile. The polymn. proceeded well in DMF solvent at 100°, to give a relatively high yield (79%), even without an addnl. catalyst. The polymn. soln. became increasingly more viscous and darker brown as the reaction proceeded. Instrumental analyses revealed that the present polymer had a conjugated backbone system and side-chain-appended azobenzene moieties. The FT-IR spectrum of the resulting polymer did not show the acetylenic CYC bond stretching and acetylenic CYH bond stretching frequencies of 2-ethynylpyridine. 26029-68-5 and 1945-84-2 which are cas registry numbers of chemicals are mentioned. Instead, the C:C stretching frequency peak of the conjugated polymer backbone (at ca. 1600 cm-1) became relatively more intense than those of the C:C and CYN stretching frequencies of 2-ethynylpyridine and 4-[4-(6-bromohexyloxy)phenylazo]benzonitrile. The absorption spectrum began at ca. 800 nm; it displays a weak absorption band in the visible region, due to the p ? p* interband transition of the polymer backbone, which is a characteristic peak of conjugated polyene backbone systems. The photoluminescence spectrum showed that the PL peak is located at 542 nm, corresponding to a photon energy of 2.29 eV. .