36 research outputs found
Monima: A Novel of the Immigrant Experience in the Multilingual Early Republic
Get PDFFirst published in 1802, Monima offers a unique look at the lives of the poor in Philadelphia: Describing her novel as a very plain picture of life, a plea on behalf of the oppressed, and life-worn children of affliction,\u27\u27 the author exposes the class fractures within a society we have mythologized as egalitarian (99). Such myths, the novel shows, are based on ignorance; as one character, awakened to the existence of the poor, remarks, one half of the world don\u27t know how the other half live (196). Though the identity of Monima\u27s author was not discovered for over 220 years, the novel\u27s focus on the immigrant underclass reflects her lived experience. Mary Endress Ralston was the trilingual child of German and French immigrants whose fortunes rose and fell in the Revolutionary era. But rather than writing a factual record of her life, Mary Ralston created her portrait of Monima and her world through a complex multilingual and multiethnic alchemy. The resulting novel, which highlights language justice through the trials of its beleaguered heroine and her father, is a complex synthesis of literary modes that has been largely overlooked. We are proud to present Monima, the first American novel by an English,language learner, and Mary Endress Ralston, an early American novelist who has been hiding in plain sight
Manipulations of photoactive nanostructures
No full text[[sponsorship]]原子與分子科學研究所[[note]]已出版;有審查制度;具代表
Inorganic–organic hybrid materials based on Co(III) tetra-aza-macrocyclic complexes and Lindqvist type poly-oxo anions: Synthesis, characterization and spectroscopy of [CoIII(L)(NO2)2]2[Mo6O19] and [CoIII(L)(NCS)2]2[W6O19]·2CH3CN (L=Transdiene)
No full textThis article describes the synthesis and characterization of two polyoxometalate based ion-pair compounds [CoIII(L)(NO2)2]2[Mo6O19] (1) and [CoIII(L)(NCS)2]2[W6O19]·2CH3CN (2) (L = 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene). They have been isolated by anionic metathesis of the respective perchlorate and thiocyanate salts with the Lindqvist type isopolyanions. The detailed spectroscopic (IR, UV-visible and ESR) analyses have been performed on compounds 1 and 2 along with their unambiguous crystal structure determination. The polyoxometalate cluster anions not only serve as the counter anions but are also involved in extensive non-covalent interactions with the macrocyclic cationic complexes in their respective crystals. Phase homogeneity of the synthesized compounds in bulk has been established by the X-ray powder diffraction study. Thermal analysis has also been carried out on the title compounds
Donor-acceptor amphiphilic 2,2'-bipyridine chromophores: synthesis, linear optical, and thermal properties
No full textTwo symmetrical and one unsymmetrical 'push-pull' amphiphilic 2,2'-bipyridine chromophores have been synthesized through Horner-Wordsworth-Emmons and Knoevenagel reaction mechanized synthetic protocols and characterized by spectroscopy. Linear optical properties and thermal stability of the synthesized chromophores have been investigated
Polyoxometalate associated ion-pair solid based on a crown ether inclusion complex: synthesis, structure and spectroscopy
No full textA supramolecular complex, in which a mono-protonated ortho-phynelenediamine (OPDAH)+ is included in the cavity of a crown ether (18-crown-6, 18C6) and a tetrabutyalammonium cation are associated with an isopolyanion [Mo6O19]2- resulting in the formation of compound [Bu4N][OPDAH(18C6)][Mo6O19] (1). Compound 1 has been isolated as a single crystalline material at room temperature from MeCN—CH3COOH solvent system through a one-pot synthesis that includes OPDA, 18-crown-6 and [Bu4N]2[Mo6O19]. Compound 1 has been characterized through routine spectroscopic analyses (IR, 1H NMR) and elemental analysis including its structural determination through single crystal X-ray crystallography. Crystal data for 1: monoclinic, C2/c, a = 17.5055(10) Å, b = 16.2661(9) Å, c = 37.006(2) Å, β = 94.8510(10)°, V = 10499.7(10) Å3, Z = 8, R1 = 0.0571, wR2 = 0.1214. Extensive supramolecular hydrogen bonding and p-stacking interactions have been observed in the crystal packing of 1
A copper-cyclen coordination complex associated with a polyoxometalate anion: synthesis, crystal structure and electrochemistry of [Cu(cyclen)(MeCN)][W<SUB>6</SUB>O<SUB>19</SUB>]
No full textThe reaction between Cu(NO3)2·3H2O and a tetra-aza macrocycle, more specifically, cyclen in 1:1 MeCN-MeOH solvent mixture forms a Cu2+-cyclen coordination complex in situ, that has been reacted with an isopolyanion [W6O19]2- in a slow diffusion technique, resulting in the isolation of an ion-pair solid [Cu(cyclen)(MeCN)][W6O19] (1). Single crystal structural investigation on 1 shows a square pyramidal geometry around the metal centre (copper ion) with an axially bound MeCN solvent molecule. The title compound 1 is the first crystallographically characterized ion-pair compound, in which a transition metal coordination complex of a tetra-aza-crown ether (cyclen) has been associated with a polyoxometalate cluster anion. This communication deals with synthesis, spectroscopic, structural and electrochemical analyses of compound 1
Bringing an important macrocycle into a polyoxometalate matrix: synthesis, crystal structure, spectroscopy and electrochemistry of [Co<SUP>III</SUP>(transdiene)(Cl)<SUB>2</SUB>]<SUB>2</SUB>[Mo<SUB>6</SUB>O<SUB>19</SUB>], [Ni<SUP>II</SUP>(transdiene)][W<SUB>6</SUB>O<SUB>19</SUB>]·DMSO·DCM and [Zn<SUP>II</SUP>(transdsiene)(Cl)]<SUB>2</SUB>[W<SUB>6</SUB>O<SUB>19</SUB>]
No full textThree polyoxometalate based ion pair solids (1-3), in which CoIII (d6), NiII (d8) and ZnII (d10) complexes of a tetra-aza macrocycle, Me6-trans-[14]-diene act as the cationic moieties, have been reported. The title complexes, formulated as [Co (C16H32N4)(Cl)2]2[Mo6O19] (1), [Ni(C16H32N4)][W6O19]·DMSO·DCM (2) and [Zn(C16H32N4)(Cl)]2[W6O19] (3) (C16H32N4 = Me6-trans-[14]-diene), are the first crystallographic paradigms where transition metal complexes of a Schiff condensed tetra-aza macrocycle have been associated with an isopolyanion, [M6O19]2- (M = Mo(VI) and W(VI)). Compounds 1-3 have been characterized through routine spectroscopic analyses including elemental analysis and their structures have been unambiguously determined through single crystal X-ray crystallography. The molecules of compound 1 assemble obeying P11̅(#2) space symmetry, whereas those of compounds 2 and 3 follow the higher symmetrical ensemble P21/c (#14). The ESR spectral studies of compounds 1-3 have revealed their diamagnetic (low-spin) nature. The last part of this article describes the electrochemical properties of the title compounds
Supramolecular architectures from ammonium-crown ether inclusion complexes in polyoxometalate association: Synthesis, structure, and spectroscopy
No full textThe tetrahedral (Td) molecular cation ammonium ion (NH4+) gets incorporated with the smaller-cavity crown ethers through three N+-H···O hydrogen bonding interactions, while the fourth N-H bond is projected outward from the crown ether cavity. A hydrogen bonding acceptor, such as a polyoxometalate anion, if placed in suitable position in the crystal lattice, can interact with the ammonium-crown ether supramolecular complex involving the fourth N-H bond donation. This article describes supramolecular association of ammonium-crown ether host-guest complexes with polyoxometalate anions in five crystalline solids, formulated as [NH4(B18C6)][Bu4N][Mo6O19] (1), [NH4(B18C6)]4[SiW12O40]·2CH3CN (2), [NH4(DB18C6)]2[Mo6O19]·4H2O (3), [NH4(DC18C6)]2[Mo6O19] (4), and [NH4(DB30C10)]2[Mo6O19]·CH3COOH (5), where B18C6 = benzo-18-crown-6, DB18C6 = dibenzo-18-crown-6, DC18C6 = dicyclohexyl-18-crown-6, and DB30C10 = dibenzo-30-crown-10. Single crystal X-ray structural investigations on these solids confer P? space symmetry (No. 2) for the compounds 1-2; C2/c space symmetry (No. 15) for the compound 3; P21/n space symmetry (No. 14) for the compound 4, and C2/m (No. 12) space symmetry for the compound 5. Careful examination of the supramolecular interactions between the different molecular fragments show direct contact between the ammonium cation and the polyoxometalate anion (N+-H···O) in the crystal structure of the compounds 1, 2, and 4. Lattice water molecules have taken the role of hydrogen bonding acceptor (N+-H···O) in the crystal structure of compound 3, while the larger and flexible crown ether DB30C10 has wrapped around the ammonium cation in the case of compound 5. Thus, there is no direct supramolecular interaction between the ammonium cation and the polyoxometalate anion (N+-H···O) in the crystal structures of compounds 3 and 5, where the ammonium-crown ether cations are associated with the polyoxometalate anions only via C-H···O hydrogen bonding interactions. Detailed spectroscopic (IR, 1H NMR, and UV-visible) analyses have been included in comprehending the supramolecular association between the inclusion complexes and polyoxometalate anions. The X-ray powder diffraction analyses have been performed to scrutinize the phase purity of the solids
