Molecular Catalysis
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2023
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IF 4.6
Xiaozhong Wang,Jiali Hu,Cai Xu,Yingqi Chen,Liyan Dai
Herein, a series of NiCu/Al 2 O 3 catalysts were prepared by impregnation method and subsequent thermal treatment under different reduction temperatures. The catalysts exhibited excellent catalytic activity for the amination of diethylene glycol (DEG), and satisfactory yield of tertiarybutylaminoethoxyethanol (TBEE) could be obtained. XRD, N 2 adsorption-desorption, SEM, TEM, XPS, and H 2 -TPR were employed to characterize the catalysts, the interaction between Ni and Cu on the catalytic activity was studied. It was found that NiCu alloy was formed after catalyst reduction, which strengthened the reduction ability of NiO and increased the number of Ni 0 active center, contributing to the enhanced catalytic activity. Moreover, the effects of reaction parameters on catalytic activity were explored. There was no need for a solvent, only 3 molar equivalents of tert‑butylamine (TBA) and 1 wt.% catalyst was required. After 7 h of reaction at 220 °C, satisfactory conversion (89.6%) and selectivity (84.6%) were obtained over the prepared catalyst. Cycle experiment demonstrated that the prepared catalyst retained excellent stability and reusability after six runs without significant loss of catalytic activity. This work provided an efficient catalyst for the catalytic amination of diethylene glycol with tert‑butylamine to TBEE.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2021
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IF 3.196
Xuejuan Yang,Yanhong Zhu,Xinlei Chen,Xingjun Gao,Shouwen Jin,Bin Liu,Li He,Bin Chen,Daqi Wang
Cocrystallization of the simplest bulky organic amine, tert‑butylamine (L), with a series of organic acids got a whole of 10 anhydrous salts with the compositions: tert‑butylammonium 2-(4-chlorophenoxy)-2-methylpropionate [(HL) + ·(cpmppa − ), cpmppa − =2-(4-chlorophenoxy)-2-methylpropionate] (1) , bis(tert‑butylammonium) dibenzoyl- l -tartarate [(HL + ) 2 ·(dbztat) 2− , (dbztat) 2- = dibenzoyl- l -tartarate] (2) , tert‑butylammonium pyrazinecarboxylate [(HL + )·(pyrca) − , pyrca = pyrazinecarboxylate] (3) , tert‑butylammonium 2-(4-chlorobenzoyl)benzoate [(HL + )·(cbzbz) − , cbzbz = 2-(4-chlorobenzoyl)benzoate] (4) , tert‑butylammonium 3-methylsalicylate [(HL + )·(3-msal) − , 3-msal = 3-methylsalicylate] (5) , tert‑butylammonium 4-methylsalicylate [(HL + )·(4-msal) − , 4-msal = 3-methylsalicylate] (6) , tert‑butylammonium 2‑chloro-4-nitrobenzoate [(HL + )·(cnba) − , cnba = 2‑chloro-4-nitrobenzoate] (7) , tert‑butylammonium 4‑bromo-3,5-dimethoxy benzoate [(HL + )·(bdmbza) − , bdmbza = 4‑bromo-3,5-dimethoxy benzoate] (8) , tert‑butylammonium 3,5-diiodosalicylate [(HL + )·(didsal) − , didsal = 3,5-diiodosalicylate] (9) and tert‑butylammonium 3,5,6-trichlorosalicylate [(HL + )·(tcsal) − , tcsal =3,5,6-trichlorosalicylate] (10) . The salts have been featured by XRD, IR and EA, the melting points were also gauged. Their structural and supramolecular aspects are analyzed in detail; all compounds are ionic with H-transferring to the tert‑butylamine. The result unveils that among the whole investigated crystals the NH 2 units in L are protonated when the acids are deprotonated and the crystal packing is interpreted via the strong charge-assisted N H⋯O H-bond from the NH 3 + and the CO 2 − . Apart from the N H⋯O H-bond, the O H···O H-bonds were also found at 5, 6, 9 and 10. 3, 9 and 10 had the additional N H⋯N, N H···I and N H···Cl H-bonds, respectively. Deep analysis of the crystal packing uncovered that a different set of additional O···O, Cl···Cl, Cl···O, Br···O, I···I, CH 3 ···C, CH 3 ···CH, CH 3 ···CH 3 , CH···O/CH 3 ···O, CH 3 ···Cl and CH 3 ···π contacts contribute to the stabilization and expansion of the total structures. For the synergism of the various nonbonding forces these structures had the homo/hetero supramolecular synthons. Some classical synthons of R 2 2 (8), R 4 2 (8), R 4 3 (10) and R 4 4 (12), commonly contained in solids of organic acids with amine, were present in these hydrogen bonding nets.
研究领域:
化学
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晶体学
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超分子化学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2012
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IF 1.693
Yabo Hao,Songhong Zhang,Kejian Yao
Vapor–liquid equilibrium (VLE) data for methanol + tert-butylamine + N,N-dimethylformamide (DMF) and constituent binary systems containing tert-butylamine at 101.3 kPa were measured. A maximum boiling point azeotrope was observed at the methanol mole fraction of 0.763, corresponding to the temperature of 340.28 K for the binary system methanol + tert-butylamine. The binary equilibrium data were correlated using Wilson, nonrandom two-liquid (NRTL), and universal quasichemical activity coefficient (UNIQUAC) models, respectively. The VLE data of the ternary system were calculated with the binary interaction parameters of the NRTL model, and the average absolute deviations of the equilibrium temperature and the vapor-phase mole fractions for methanol and tert-butylamine were about 0.87 K, 0.014, and 0.018, respectively. The results show that DMF can break the azeotrope of the methanol + tert-butylamine system as a solvent.
研究领域:
化学工程
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物理化学
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Li Fu,Pengjie Dong,Zerui Liu,Qi Li,Yingshu Guo
Screening a novel electrochemiluminescence (ECL) system and lowering the ECL triggering potential are essential to ECL evolution. Herein, the near-infrared (NIR) ECL system with low-triggering potential ECL was constructed with weakly reductive tert-butylamine borane as coreactant and mercaptosuccinic acid/citrate (MSA/Cit)-capped Au (MSA/Cit@AuNCs) as luminophores. Toxic-element-free and dual-ligand MSA/Cit@AuNCs were prepared via ligand exchange and utilized as a model for developing unary metal NCs-based luminophores with more enhanced ECL performance than monoligand Au nanocrystals (AuNCs), which exhibited a two hole-injected process at around 0.48 and 0.80 V, respectively. Beneficial to the intrinsic low hole-injected potential of AuNCs, MSA/Cit@AuNCs exhibited similar low-triggering ECL potential at around 0.57 V with the participation of series coreactants or not, originating from the recombination of an internal prestored electron within the conduction band (CB) and electroinjected holes at around 0.25 V. Furthermore, the enhanced low-triggering potential around 0.57 V and NIR ECL around 835 nm of MSA/Cit@AuNCs was eventually obtained with the reductive tert-butylamine borane or N2H4·H2O containing a −C–N single-bond structure merely as coreactant. The low-triggering potential ECL of MSA/Cit@AuNCs/tert-butylamine borane system at 0.57 V can be harnessed to selectively determine a carcinoembryonic antigen (CEA) with one linear range spanning from 2 to 20000 fg/mL and a limit of detection of 0.33 fg/mL (S/N = 3). This study will contribute to a more comprehensive understanding of the ECL mechanism in terms of both regulating NCs and selecting coreactants.
研究领域:
分析化学
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纳米技术
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生物化学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）