• Analytical Science and Technology
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• v.15 no.2
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• pp.135-141
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• 2002

The new tridentate poly-amine ligands, N,N-Bis(2-amino-ethyl)-methyl amine${\cdot}$2HBr (BAMA${\cdot}$2HBr), N,N-Bis(2-amino-ethyl)-ethylamine${\cdot}$2HBr (BAEA${\cdot}$2HBr), N,N-Bis(2-amino-ethyl)-propylamine${\cdot}$2HBr (BAPA${\cdot}$2HBr) and N,N-Bis(2-amino-ethyl)-butylamine${\cdot}$2HBr (BABA${\cdot}$2HBr) were synthesized as their dihydrobromic-salt and characterized by EA, IR, NMR and Mass spectroscopy. The protonation constants of the ligands and stability constants of transition metal(II) complexes were determined in aqueous solutions by potentiometry and compared with diethylenetriamine. Stability constants for transition metal complexes of ligands are in the order of BAMA < BAEA < BAPA > BABA. The larger value of stability constants of BAPA compared to these BABA, may be attributed to the more distorted structure of the complex due to the increased steric crowding caused by the presence of the bulky N-butyl group.

• Journal of Pharmaceutical Investigation
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• v.21 no.2
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• pp.111-116
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• 1991

Dextromethorphan HBr (DMP HBr) ion exchange albumin microcapsules were prepared by the interfacial polymerization method. The incorporation of drugs in empty albumin microcapsules was more increased in case of glutaraldehyde (GA) and formaldehyde (FA) than terephthaloyl chloride (TC) as a cross linking agent. The amount of DMP HBr incorporated into empty albumin micorcapsules was augemented with increasing DMP HBr concentration and the amount of empty microcapsules in the incorporation medium. Increasing the salt concentration in the release medium, the release rate and the DMP HBr amount released from microcapsules were increased. The release rates of DMP HBr from microcapsules retarded considerably compared with DMP HBr powder.

• Journal of the Korean Applied Science and Technology
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• v.29 no.4
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• pp.545-551
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• 2012

Due to the use of polymeric materials in construction materials, the fire combustion gases that occur in the fire are various. The one of combustion gases, HBr is measured to evaluate the toxicity of the combustion gases in the FTP Code Part 2, Standard NES 713 and Standard BS 6853. According to the MSDS, Inhalation of HBr gas especially cause burn, respiratory dysfunction, headache, etc. The people who are exposed to 50ppm of HBr gas, very irritant gas may also frequently result in both immediate death and post-exposure deaths due to pulmonary complications. In this paper, we conduct a research on the combustion toxicity of HBr gas hazardous test which is motility measurement of the mice exposed to the HBr standard gas comparing the biological analysis result.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.373-376
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• 2012

건축 재료가 다변화됨에 따라 화재 시 발생되는 연소가스 또한 다양해지고 있다. 그중 HBr은 NES 713과 BS 6853에서 연소 가스의 독성 평가를 위해 측정되는 독성가스이다. 특히 산업안전물질보건자료(MSDS)에서는 HBr가스를 흡입할 경우 화상을 일으키며 호흡부전, 두통 등을 유발시킬 수 있고 50ppm의 HBr가스에 노출된 사람은 생명과 건강에 즉시 영향을 받을 수 있는 매우 유독한 연소가스이다. 본 논문에서는 HBr 표준가스를 사용하여 건축법에서 규정한 가스유해성 시험결과와 HBr가스에 노출된 mouse의 병리학적 관찰 결과를 비교 분석하여 HBr의 연소 독성에 관하여 연구를 진행하였다.

• Korean Journal of Weed Science
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• v.7 no.1
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• pp.78-83
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• 1987

This study was attempted to evaluate the combining effect of HBR (homobrassinolide) with the known growth regulators such as GA (gibberellic acid), BA(6-benzyl aminopurine), IAA (indole-3-acetic acid), B-9 (N-dimethylamino succinamic acid) and CCC (2-chloroethyl-trimethylammonium chloride) on the growth of radish hypocotyl. A single application of HBR increased hypocotyl growth as its rates increased from 0.1 to 1.0 ppm, showing a maximum increase at 1.0 ppm. GA and BA had no direct effects on hyopcotyl growth, but IAA showed some effect as its concentration increased. However, the mixed application of HBR with GA, BA and IAA increased the length of radish hypocotyl as the concentration of HBR became higher. The mixture of HBR with GA and BA showed antagonistic reaction on radish hypocotyl growth, but synergistic effect was shown in the higher rate mixture of HBR with IAA in the range of HBR at 0.03 to 0.30 ppm with IAA at 3.0 to 10.0 ppm, but antagonistic or additive response at the mixture of low rates. An increased growth of hypocotyl by HBR was ified by CCC, showing the strong antagonistic reaction, but B-9 was not able to ify HBR's effect on hypocotyl growth.

• Journal of Environmental Science International
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• v.15 no.8
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• pp.799-809
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• 2006

Hydrobromic acid salts of new N, N, O tridentate ligands containing phenol, 2-[(2-Methylamino- ethyl- amino)-methyl]-phenol(H-MMP. 2HBr), 5-Bromo-2-[(2-Methylamino-ethylamino)-methyl]-phenol (Br- MMP. 2HBr), 5-Chloro-2-[(2-Methylamino-ethylamino)-methyl]-phenol(Cl-MMP. 2HBr), 5-Methyl-2-[(2-Methylamino-ethylamino)-methyl]-phenol(Me-MMP. 2HBr), 5-Methoxy-2-I(2-Methylamino-ethylamino)- methyl]-phenol(MeO- MMP. 2HBr) and. 1-[(2-Methylamino-ethylamino)- methyl]-naphthalen-2-ol(Nap- MMP. 2HBr) were synthesized. The synthesized ligands were confirmed by C. H. N. atomic analysis, UV-visible and IR spectroscopies, $^1$H NMR, $^{13}$C NMR and mass analysis. The potentiometry study revealed that the proton dissociation constants(logK$_n^H$) of the synthesized ligands and stability constants (logK$_{ML}$, logK$_{LM2}$) of transition metal complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II) ions occurred in three steps and the order of the calculated overall proton dissociation constants(log$\beta_p$) and stability constants (logK$_{ML}$) of ligands was Br-MMP. 2HBr < Cl-MMP 2HBr < H-MMP. 2HBr < Nap-MMP. 2HBr < Me-MMP. 2HBr < MeO-MMP. 2HBr. The order showed a similar trend to that of Hammett substituent constants($\delta_p$). The synthesized ligands usually form 2:1(ML$_2$) complexes with transition metal ions. The order of the stability constants of each transition metal ions was Co(II) < Ni(II) < Cu(II) ;> Zn(II) ;> Cd(II) ;> Pb(II).

• Journal of the Korean Vacuum Society
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• v.6 no.3
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• pp.267-274
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• 1997

Silicon shallow trenches applied to the STI (Shallow Trench Isolation) of integrated circuits were etched using inductively coupled $Cl_2$ and HBr/$Cl_2$ plasmas and the effects of process parameters on the etch profiles of silicon trenches and the physical damages on the trench sidewall and bottom were investigated. The increase of inductive power and bias voltage in $Cl_2$ and HBr/$Cl_2$ plasmas increased polysilicon etch rates in general, but reduced the etch selectivities over nitride. In case of $Cl_2$ plasma, low inductive power and high bias voltage showed an anisotropic trench etch profile, and also the addition of oxygen or nitrogen to chlorine increased the etch anisotropy. The use of pure HBr showed a positively angled etch profile and the addition of $Cl_2$ to HBr improved the etch profile more anisotropically. HRTEM study showed physical defects formed on the silicon trench surfaces etched in $Cl_2/N_2$ or HBr/ $Cl_2$ plasmas.

• Korean Journal of Weed Science
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• v.7 no.1
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• pp.84-89
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• 1987

This study was conducted to determine the combining effects of a synthetic brassinolide such as homobrassinolide (HBR) with auxin types on the curvature of radish petiole. HBR has no direct effect on the petiole curvature of radish, regardless of concentrations used. Among the natural known plant growth regulators, NAA at 100ppm showed the highest ourvature at 12 hours after treatment. The synthetic auxins such as 2,4-D and MCP resulted in about three times greater effect on curvature than the untreated control, and their effects lasted till 36 horns after treatment, showing much better effect on curvature than that of the natural auxin types of plant growth regulators. The mixture of MCP at 3 ppm with HBR at 100ppm increased petiole curvature of radish seedlings as much as three times greater than that of a single application of HBR. However, the mixture of HBR at 100 ppm plus 2, 4-D at 100ppm increased the petiole curvature of radish seedlings about eight times greater than that of the HBR single application, showing existance of strong synergistic reaction and the most effective combination, and suggesting possibility of a prectical implementation in agriculture.

• Analytical Science and Technology
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• v.19 no.2
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• pp.131-141
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• 2006

Hydrobromic acid salt of a $N_2O_2$ tetradentate ligand, N,N'-bis(2-hydroxybenzyl)-ethylene-diamine ($H-BHE{\cdot}2HBr$) was synthesized. $Br-BHE{\cdot}2HBr$, $Cl-BHE{\cdot}2HBr$, $CH_3-BHE{\cdot}2HBr$ and $CH_3O-BHE{\cdot}2HBr$ having Br, Cl, $CH_3$ and $CH_3O$ substituents at 5-position of the phenol group of $H-BHE{\cdot}2HBr$ were also synthesized. $Nap-BHE{\cdot}2HBr$ having naphthalen-2-ol instead of the phenol group was also synthesized. The potentiometry study in aqueous solution revealed that the proton dissociations of the synthesized ligands occurred in four steps and the order of the calculated overall proton dissociation constants (${\log}{\beta}_p$) of each ligand was Br-BHE < Cl-BHE < H-BHE < Nap-BHE < $CH_3$-BHE < $CH_3O$-BHE. The order showed a similar trend to that of Hammett substituent constants(${\sigma}_P$). The order of the stability constants (${\log}K_{ML}$) was CO(II) < Ni(II) < Cu(II) > Zn(II) > Cd(II) > Pb(II). The order in their stability constants (${\log}K_{ML}$) of each transition metal complex agreed well with that of the overall proton dissociation constants (${\log}{\beta}_p$).

• Journal of the Korean Chemical Society
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• v.53 no.2
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• pp.133-136
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• 2009

We present calculations for the 4-aminopyrimidine (4AP) – HCl and –HBr complexes. We predict that the charge separated (zwitterionic) form [4AP$H^+-Cl^-$] is not stable, but that [4AP$H^+-Br^-$] is stable enough for experimental detection in gas phase at low temperatures. The latter observation is attributed to smaller dissociation energy of HBr compared with HCl, and to “solvation” of HBr by the amino group in 4AP.