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1. |
Synthesis and Molecular Structure of the Amido-Bridged Dinuclear Rhodium Complex [Cp*Rh{μ2-(NH)2C10H6-2,3}(μ2-Cl)RhCp*][PF6] (Cp* = η5-C5Me5) |
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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
Volume 342,
Issue 1,
2000,
Page 1-6
Hiroyuki Matsuzaka,
Teruo Kamura,
Ko Ariga,
Takashi Okubo,
Tomohiko Ishii,
Masahiro Yamashita,
Mitsuru Kondo,
Susumu Kitagawa,
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摘要:
Reaction of [Cp*RhCl2]2(1) with (LiNH)2C10H6-2,3 gives the mononuclear species Cp*Rh(NH)2C10H6-2,3 (3), which is selectively converted to the amido-bridged dinuclear Rh(III) complex [Cp*Rh{μ2-(NH)2C10H6-2,3}(μ2-Cl)RhCp*]PF6(4; Cp* = η5-C5Me5) upon treatment with1/AgPF6in acetone. The molecular structure of4has been determined by X-ray crystallography.
ISSN:1058-725X
DOI:10.1080/10587250008038237
出版商:Taylor & Francis Group
年代:2000
数据来源: Taylor
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2. |
Metal-Carborane Multidecker Sandwiches as Building Blocks for Metallopolymers and Nanostructured Materials |
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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
Volume 342,
Issue 1,
2000,
Page 7-14
RussellN. Grimes,
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摘要:
The ability of cyclic planar [RR'C2B3H2X]4−carborane ligands (R, R′ = alkyl, aryl, SiMe3, H; X = alkyl, Cl, Br, I, H) to bind tightly to transition and main-group metals on both sides of the C2B3 ring plane allows the construction of a wide range of polymetallic multidecker sandwich complexes involving different metals, metal oxidation states, and molecular architectures. Although these ligands are isoelectronic and isosteric analogues of C5H5−, they form stronger covalent bonds to metal centers, and can stabilize many robust, isoluhle structural types that are not readily accessible (or are completely unknown) in metallocene chemistry. Many of these metallacarborane sandwich complexes are paramagnetic and exhibit extensive electron-delocalization that can be “tuned” by redox action or by the introduction of appropriate substituents to the carborane ligands or the metal centers. This remarkable versatility suggests that there is considerable potential for the creation of novel polymeric and solid state materials that can be tailored to have desired electronic, optical, or other properties. This review summarizes recent efforts in the designed syntheses of oligomeric and polymeric systems and the systematic exploration of structure-property relationships.
ISSN:1058-725X
DOI:10.1080/10587250008038238
出版商:Taylor & Francis Group
年代:2000
数据来源: Taylor
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3. |
Measurement of Association Constants in Metal Orotate Complexes by1H NMR Spectroscopy: the Metal Substituent Effect on Triple Hydrogen Bonding Ability |
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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
Volume 342,
Issue 1,
2000,
Page 15-27
Xingling Xu,
Michael Hynes,
StuartL. James,
D. Michael,
P. Mingos,
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摘要:
The metal substituent effect on complementary triple hydrogen bonding pairs was investigated by1H NMR spectroscopy. The results demonstrated that the metal ion reduced the hydrogen bonding ability of the ADA complex [NBu4][Rh(cod)(orotate)] with 2,6-diaminopyridine.
ISSN:1058-725X
DOI:10.1080/10587250008038239
出版商:Taylor & Francis Group
年代:2000
数据来源: Taylor
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4. |
Self-Assembly of Interlocked Structures and Open Framework Materials using Coordination Bonds |
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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
Volume 342,
Issue 1,
2000,
Page 29-38
Jungseok Heo,
Soo-Young Kim,
Soo-Gyun Roh,
Ki-Min Park,
Gil-Jae Park,
Dongmok Whang,
Kimoon Kim,
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摘要:
Syntheses of molecular necklaces and open framework materials using coordiantion bonds are described. In the synthesis of molecular necklaces, the barrel-shape molecule cucurbituril is used as a molecular “bead” and metal ions or metal complexes are used as “glue” or “angle connectors”. Two different approaches were taken. In one approach, linear pseudorotaxanes react with Pt(en)(NO3)2(en = ethylenediamine) to produce [4]MNs and [5]MNs. In the other approach, a′ 2 + 2′ approach, preorganized, L-shaped pseudorotaxanes containing two molecular “beads” react with a metal ion (or a metal complex withcisvacant coordination sites) to form [5]MNs. Rubidium and cucurbituril form a one-dimensional coordination polymer in the solid state, in which cucurbituril molecules stack atop one another through coordination of their carbonyl groups to the rubidium ions in between. The coordination polymer chains are arranged in such a way as to produce a honeycomb structure with large linear hexagonal channels parallel to the polymer chains.
ISSN:1058-725X
DOI:10.1080/10587250008038240
出版商:Taylor & Francis Group
年代:2000
数据来源: Taylor
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5. |
Mono and Trinuclear Metal Complexes Containing an N3O3- Type Tripodal Ligand |
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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
Volume 342,
Issue 1,
2000,
Page 39-44
Masaaki Kojima,
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摘要:
Mononuclear and trinuclear nickel(II) and copper(II) complexes containing the N3O3-type ligand (H3L), obtained by condensation of 1,1,1-tris(aminomethyl)ethane and salicylaldehyde (1 : 3), were synthesized. Two mononuclear nickel(II) complex units ([Ni(HL)]) are aggregated due to hydrogen bonding between the phenol group of one unit and the phenolate group of the other to give a dimer with homochirality. The trinuclear nickel(II) complex. [Ni3L2] consists of three face-sharing octahedra. Three nickel(II) ions form a linear array. Two terminal nickel(II) ions are coordinated octahedrally by L. The central and two terminal nickel(II) ions are bridged by six phenolate oxygen atoms. In the mononuclear square-planar copper(II) complex, [Cu(HL)], one arm of the tripodal ligand is not coordinated to the metal. On the basis of the absorption spectra of the copper(II) complexes, the coordination geometry around each copper ion of the trinuclear complex is assigned to be square planar and copper ions will be bridged by L.
ISSN:1058-725X
DOI:10.1080/10587250008038241
出版商:Taylor & Francis Group
年代:2000
数据来源: Taylor
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6. |
Spontaneous Reduction of Gold(III) to Gold(I) by Forming Sulfur-Bridged Polynuclear Structure with Octahedral Tris(Thiolato) Complexes |
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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
Volume 342,
Issue 1,
2000,
Page 45-50
Takumi Konno,
Keiji Tokuda,
Tomomi Abe,
Masakazu Hirotsu,
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摘要:
The reaction offac(S)-[RhIII(aet)3] (aet = 2-aminoethanethiolate) with [AuIIICl4]−in water gave an S-bridged pentanuclear complex [AuI3{RhIII-(aet)3}2]3+(1), accompanied by the spontaneous reduction of AuIIIto AuI. The crystal structure of1(NO3)3·4H2O was determined by X-ray crystallography. In1two octahedralfac(S)-[Rh(aet)3] units are linked by three linear AuIatoms to form a trigonal-bipyramid-type RhIII2AuI3pentanuclear structure with an averaged AuI-AuIdistance of 3.083(5) Å. The two RhIII2AuI3cations contact with each other through one AuI-AuIinteraction with a distance of 3.311(3) Å. The optically active δδ-1was derived from ΔΔΔΔ-[Zn3(OH){Rh(aet)3}4]5+by reacting with [AuCl4]−in water.
ISSN:1058-725X
DOI:10.1080/10587250008038242
出版商:Taylor & Francis Group
年代:2000
数据来源: Taylor
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7. |
Supramolecular Porphyrin Assemblies for Photosynthetic Antenna Mimics |
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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
Volume 342,
Issue 1,
2000,
Page 51-56
Yoshiaki Kobuke,
Naoto Nagata,
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摘要:
In order to construct artificial functional mimics of photosynthetic antenna complexes, two N-methylimidazole substituents were introduced at the facing meso positions of porphyrin and metalated by Mg2+ion. In contrast to the specific dimer formation of pentacoordinating Zn atom, Mg metal center accepted the 6th ligation by imidazole and extended the slipped cofacial coordination to higher organized structures. FT Ion spray mass spectrum detected porphyrin oligomers up to a pentamer when the sample was prepared from a MeOH solution, and a heptamer from a CHCl3-MeOH (1/1) solution. When imidazole instead of N-methylimidazole was employed as the porphyrin substituent, Zn2+dimer, they further connected each other by hydrogen bonds to extend the supramolecular structure with a characteristic splitting and significant broadening of the Soret band.
ISSN:1058-725X
DOI:10.1080/10587250008038243
出版商:Taylor & Francis Group
年代:2000
数据来源: Taylor
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8. |
Synthesis and Properties of Europium Complex of Polybenzimidazole Containing N-Eu Bond |
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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
Volume 342,
Issue 1,
2000,
Page 57-62
Isao Yamaguchi,
Masakazu Arai,
Kohtaro Osakada,
Takakazu Yamamoto,
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摘要:
NaH promoted deprotonation of the NH groups in poly(benzimidazole)s, [-Im-C6H4-]n(1a) (Im: 5,5′-dibenzimidazole-2,2′-diyl) and [{-Im-(CH2)11O(CH2)11-}0.98{-Im-(CH2)10}0.02-]n(1b) followed by addition of 4 equiv. of EuCl3gave new soluble Eu complexes of poly(benz-imidazole)s (2aand2b) having N-Eu bonds in 66 and 42% yields, respectively. The Eu polymer complexes2aand2bhave two molecules of Cl and DMSO as ligands, which was revealed from IR and1H NMR spectra and elemental analysis. Energy transfer from the benzimidazole group in polymer main chain to the Eu(III) metal was occurred upon irradiation with UV light in the solid state. This resulted in light emission from both the polymer chain and the Eu(III) center, although the Eu(III) itself could not be excitated by irradiation with the UV light.
ISSN:1058-725X
DOI:10.1080/10587250008038244
出版商:Taylor & Francis Group
年代:2000
数据来源: Taylor
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9. |
Synthesis, Structure, and Magnetic Properties of Tetranuclear Copper(II) Complexes of Tridentate Dianionic Ligands with anONODonor Set |
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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
Volume 342,
Issue 1,
2000,
Page 63-68
Hiromi Yamashita,
Masayuki Koikawa,
Tadashi Tokii,
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摘要:
Tetranuclear complexes [CuL2H]4(1), [CuL2Me]4(2), and [CuL2Cl]4(3) with a reduced Schiff base type tridentate ligand H2L2H and its homologous with a substituent on the 2-hydroxymethylphenyl moiety (4-Me, H2L2Me; 4-Cl, H2L2Cl) were prepared and characterized by elemental analyses and magnetic measurements. The crystal structure of1was determined by X-ray crystallography. Tetracopper core is represented as a dimer-of-dimers structure by the stacking of two dicopper units bridged by alcoholic oxygens. One of the dicopper units contains square pyramidal (SP) Cu(II) ions, whereas the geometry of each Cu(II) ion in the other unit is described as essentially distorted trigonal bipyramid (TBP). Magnetic behaviors of the complexes are explained by modified equation based on the theoretical Spin Hamiltonian. The exchange integrals (-2J) are evaluated at 292–366 cm−1for SP dicopper cores and 104–120 cm−1for TBP, respectively, indicating the existence of different type of antiferromagnetic interaction-pathways corresponded to each copper geometry.
ISSN:1058-725X
DOI:10.1080/10587250008038245
出版商:Taylor & Francis Group
年代:2000
数据来源: Taylor
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10. |
Unique Self-Organization System Derived from Biguanidato and Biuretato Complexes Through Triple Hydrogen-Bonds |
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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
Volume 342,
Issue 1,
2000,
Page 69-74
Hideki Kitamura,
Tomohiro Ozawa,
Koichiro Jitsukawa,
Hideki Masuda,
Hisahiko Einaga,
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摘要:
A unique triple hydrogen-bonding system has been constructed between the transition metal (Ni(II), Cu(II), Co(III)) complexes with bis(biphenylbiguanidato) andortho-phenylenebis(biuretato) ligands, which have been characterized by IR and1H-NMR spectroscopies and thermogravimetric and X-ray structure analyses.
ISSN:1058-725X
DOI:10.1080/10587250008038246
出版商:Taylor & Francis Group
年代:2000
数据来源: Taylor
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