153759-58-1Relevant articles and documents
Efficient fixation of CO2 by a zinc-coordinated conjugated microporous polymer
Xie, Yong,Wang, Ting-Ting,Yang, Rui-Xia,Huang, Nian-Yu,Zou, Kun,Deng, Wei-Qiao
, p. 2110 - 2114 (2014)
Zinc-coordinated conjugated microporous polymers (Zn-CMPs), prepared by linking salen zinc and 1,3,5-triethynylbenzene, exhibit extraordinary activities (turnover frequencies of up to 11600 h-1), broad substrate scope, and group tolerance for the synthesis of functional organic carbonates by coupling epoxides with CO2 at 120 °C and 3.0 MPa without the use of additional solvents. The catalytic activity of Zn-CMP is comparable to those of homogeneous catalysts and superior to those of other heterogeneous catalysts. This catalyst could be reused more than ten times without a significant decrease in performance.
Novel structurally characterized Co(II) metal-organic framework and Cd(II) coordination polymer self-assembled from a pyridine-terminal salamo-like ligand bearing various coordination modes
Wang, Ji-Fa,Feng, Tao,Li, Ya-Juan,Sun, Yin-Xia,Dong, Wen-Kui,Ding, Yu-Jie
, (2021)
Two novel structurally characterized Co(II) metal-organic framework (Co(II) MOF) and Cd(II) coordination polymer (Cd(II) CP), [{Co(L)}2]n·nCH3COCH3 and [Cd(H2L)(CH3COO)2]n were self-assembled from a newly designed salamo-like ligand H2L bearing double terminal pyridine groups and Co(II) and Cd(II) ions, respectively. In the Co(II) MOF, the Co1 and Co2 ions are six-coordinated octahedron geometries, have similar coordination environments, and are located in the N2O2 cavities of the ligand (L)2? units, forming Co1-L and Co2-L parts, respectively. The terminal pyridine N atoms of the Co1-L (or Co2-L ) part are connected with Co1-L and Co2-L parts respectively, forming a metal-organic framework with double helix structure in thea-direction and regular channels in the c-direction. In the Cd(II) CP, Cd(II) ion is seven-coordinated single cap triangular prism geometry, did not participate in the coordination of the N2O2 cavity, but coordinated with free acetate in the solution. Two bidentate acetate anions chelate to Cd1 ion, and two Cd1 ions are bridged by O atom of one of the acetate anions to form Cd2(OAc)2 unit which was used as the junction point to connect with the terminal pyridine N atoms of H2L. Finally, the coordination polymer with large pore channels was formed. Spectroscopic analyses of H2L and its Co(II) MOF and Cd(II) CP are performed using IR, UV–Vis and fluorescence spectroscopy. TGA analyses show that the Co(II) MOF and Cd(II) CP have good stabilities. Various short-range interactions in the Co(II) MOF and Cd(II) CP are investigated through Hirshfeld surfaces analyses.
Four-component zinc-porphyrin/zinc-salphen nanorotor
?zer, Merve S.,Rana, Anup,Biswas, Pronay K.,Schmittel, Michael
, p. 9491 - 9497 (2017)
An off-axis supramolecular rotor was composed of four components: a zinc-porphyrin based stator with four phenanthroline stations and a zinc-salphen based rotator were self-assembled with DABCO and four copper(i) ions to furnish the rotor ROT-2 in quantitative yield. The DABCO serves as a connecting axle between the rotator and the stator, while the rotator is additionally connected to two copper(i)-loaded phenanthroline stations of the stator via its two pyridine terminals (Npy → [Cu(phen)]+). For the thermally activated rotation both Npy → [Cu(phen)]+ interactions have to be cleaved. Due to the high energy barrier of the rotation the slow motion was monitored by ROESY. The reduced speed (k298 = 0.2 s-1) was rationalised in terms of ground state stabilisation of the rotor as suggested by computational insight. Additional VT 1H-NMR investigation was undertaken to study the motion of DABCO that is sandwiched between zinc porphyrin and zinc salphen. The diagnostic splitting of the geminal DABCO protons was rationalised on the basis of the asymmetry induced by the salphen that generates a diastereotopic environment. Computations reproduced the experimental NMR with excellent agreement.
Fluorescence sensors based on chiral polymer for highly enantioselective recognition of phenylglycinol
Xu, Ying,Zheng, Lifei,Huang, Xiaobo,Cheng, Yixiang,Zhu, Chengjian
, p. 994 - 997 (2010)
Chiral polymer P-1 incorporating (R,R)-salen-type unit was synthesized by the polymerization of (R,R)-1,2-diaminocyclohexane with 2,5-dibutoxy-1,4-di(5-tert-butylsalicyclaldehyde)-phenylene (M-1) via nucleophilic addition-elimination reaction, and chiral polymer P-2 incorporating (R,R)-salan-type unit could be obtained by the reduction reaction of P-1 with NaBH4. The fluorescence response of two chiral polymers P-1 and P-2 on (R)- or (S)-phenylglycinol were investigated by fluorescence spectra. The fluorescence intensities of two chiral polymers P-1 and P-2 show gradual enhancement upon addition of (R)- or (S)-phenylglycinol and keeps nearly linear correlation with the concentration molar ratios of (R)- or (S)-phenylglycinol. But both P-1 and P-2 exhibited more sensitive response signals for (S)-phenylglycinol. The values of enantiomeric fluorescence difference ratio (ef) are 1.84 and 2.05 for P-1 and P-2, respectively. The results also showed that two chiral polymers P-1 and P-2 can also be used as fluorescence sensors for enantiomer composition determination of phenylglycinol.
Investigation on structurally different Cu(II) and Ni(II) complexes constructed from a novel pyridine-terminal salamo-like ligand
Wang, Ji-Fa,Xu, Xin,Bian, Ruo-Nan,Dong, Wen-Kui,Ding, Yu-Jie
, (2021)
A novel structurally characterized salamo-like ligand H2L contained double terminal pyridine groups was designed and synthesized. The single crystals of the Cu(II) and Ni(II) complexes are grown up through coordination of H2L with Cu(II) and Ni(II) ions, respectively, determined as [Cu(LH)]NO3?CH3CH2OH and [{Ni(L)}2]n·n3C5H5N·nCH3COCH3. The Cu(II) atom is located at the N2O2 cavity of the deprotonation ligand (L)2? moiety, but the N atoms of the terminal pyridine groups of the ligand (L)2? moiety is not involved in the coordination, and forms a four-coordinated twisted quadrilateral geometry. While the Ni(II) atom (Ni1 or Ni2) is sited in the N2O2 cavity of the deprotonation ligand (L)2? moiety and forms a plane, the terminal pyridine N atoms from the two adjacent [Ni(L)] moieties also coordinated with the Ni(II) atom in the axial positions to form a slightly distorted octahedral geometry with six-coordination. In the formation of MOFs, the benzene and pyridine rings of the ligand (L)2? moiety are rotated and create an angle, result to form a chiral MOFs using an achiral ligand (L)2? moiety. View of MOFs in the C direction, the Ni(II) complex has four different size of apertures in its structure, and presences a large amount of protonic hydrogen. Spectroscopic analyses of H2L and its Cu(II) and Ni(II) complexes are performed using IR, UV–Vis and fluorescence spectroscopy. Compared with the Cu(II) complex, the Ni(II) complex has better thermal stability. The magnetic analyses were also carried out. Hirshfeld surfaces analyses are carried out to analyze various short-range interactions in H2L and its Cu(II) complex.
Synthesis and catalytic activity of a chiral periodic mesoporous organosilica (ChiMO)
Baleizao, Carlos,Gigante, Barbara,Das, Debasish,Alvaro, Mercedes,Garcia, Hermenegildo,Corma, Avelino
, p. 1860 - 1861 (2003)
A chiral vanadyl salen complex having two peripheral trimethoxysilyl groups has been used to obtain a chiral periodic mesoporous organosilica having MCM-41 periodicity and the two Si-CH2 groups anchored on the framework; this solid induces 30% enantioselectivity in the cyanosilylation of benzaldehyde.
Exploring coordination behaviors, structural characterizations and theoretical calculations of structurally different Cu(II), Co(II) and Ni(II) emissive complexes constructed from a salamo-based ligand and 4,4′-bipy
Wang, Ji-Fa,Li, Ruo-Yu,Li, Peng,Dong, Wen-Kui
, (2021)
A new salamo-based ligand H2L was designed and synthesized, and its structurally different Cu(II), Co(II) and Ni(II) complexes based on ancillary ligand 4,4′-bipy were obtained. The Cu(II) complex has a mononuclear structure with the molecular formula of [Cu(L)], while the Cu(II) ion adopts a twisted four-coordinate quadrilateral geometric configuration. One dimensional chain-like supramolecular structure is formed by intermolecular interactions. In the Co(II) complex, there is a dimer structure and the molecular formula is [Co2(L)2(4,4′-bipy)]. The Co(II) ions possess five-coordinated trigonometric bipyramid geometric configurations. A two-dimensional layered supramolecular structure is formed by intermolecular interactions. The Ni(II) complex has a one-dimensional polymer structure and its molecular formula is [Ni(L)(4,4′-bipy)]n·nEtOH·nAce. The Ni(II) ions have six-coordinated octahedron geometric configurations. Through the intermolecular interactions, a three-dimensional supramolecular structure is formed. The ligand H2L and its three complexes were studied in detail by IR, UV–Vis and emissive spectra. The short-range interactions in the Cu(II), Co(II) and Ni(II) complexes were calculated by Hirshfeld surfaces analyses. The molecular orbital energy levels and molecular stability were analyzed by DFT calculations.
Stereoselective protonation of 2-methyl-1-tetralone lithium enolate catalyzed by salan-type diamines
?owicki, Daniel,Watral, Justyna,Jelecki, Maciej,Bohusz, Wiktor,Kwit, Marcin
supporting information, (2021/04/02)
Asymmetric protonation of ketone enolates is a convenient alternative to asymmetric alkylation of enolates that allows to convert racemic ketones into their optically active form. Here, we have reported an efficient enantioselective protonation of 2-methyl-1-tetralone lithium enolate catalyzed by salan-type diamines. A broad series of salan-type catalysts were synthesized, including several previously unknown, and subsequently tested in the title reaction. For the first time, a chiral amine used as organocatalyst has shown better results than as stoichiometric protonating agent. Application of only 10 mol% of salan allows to obtain the title ketone with high yield and enantiomeric excess up to 75%. The DFT calculations of the structure of the catalyst and its complex with lithium enolate were conducted, which makes it possible to propose a likely reaction mechanism.
