Journal ArticleDOI
Further structural and magnetic studies of tricopper dipyridylamido complexes.
TLDR
The compound Cu3(dpa)4Cl2, 1 (dpa = the anion of dipyridylamine), which was first synthesized and characterized in 1990, has been structurally characterized in three new crystal forms having Cu...Cu separations of 2.47-2.49 A and the possible existence of an exchange pathway in which the metal atoms interact directly with each other.Abstract:
The compound Cu3(dpa)4Cl2, 1 (dpa = the anion of dipyridylamine), which was first synthesized and characterized in 1990, has been structurally characterized in three new crystal forms having Cu···Cu separations of 2.47−2.49 A. Its magnetic properties have been studied fully. Reaction of Cu3(dpa)4Cl2 with 2 equiv of silver tetrafluoroborate yields Cu3(dpa)4(BF4)2 (2), a compound with a similar linear trinuclear structure but coordinated BF4 anions in each axial position and having shorter Cu···Cu distances of 2.40 A but similar magnetic properties. Least squares fitting of the magnetic susceptibility data for 1 and 2 gave isotropic g values of 2.007 and 2.130 and exchange parameters of −373 and −411 cm-1, respectively. This suggests the possible existence of an exchange pathway in which the metal atoms interact directly with each other.read more
Citations
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Journal ArticleDOI
Vibrational Excitations in Single Trimetal-Molecule Transistors
TL;DR: Single-molecule transistors incorporating trimetal molecules of Cu(3)(dpa)(4)Cl(2) and Ni(3)*(dpa = 2,2'-dipyridylamide) have been fabricated, showing single-electron tunneling behavior through the molecules.
Journal ArticleDOI
Molecular and Electronic Structures by Design: Tuning Symmetrical and Unsymmetrical Linear Trichromium Chains
TL;DR: The preparation, properties, and crystal structures of 12 trichromium extended metal atom chain (EMAC) compounds of the type Cr(3)(L)(4)X(2) with large variations in metal-metal distances are reported here and important comparisons with a reported DFT model of the electronic structures of the compounds are made.
Journal ArticleDOI
Oxidation of Ni3(dpa)4Cl2 and Cu3(dpa)4Cl2: Nickel−Nickel Bonding Interaction, but No Copper−Copper Bonds
TL;DR: The oxidation of 3 to 4 is accompanied by a lengthening of the Cu-Cu distances, as expected for an increase in electrostatic charge between positively charged nonbonded metal ions, which is further evidence against Cu- Cu bonding in either 3 or 4.
Journal ArticleDOI
From Homonuclear Metal String Complexes to Heteronuclear Metal String Complexes
TL;DR: In this paper, a "vending machine" was used to generate heteronuclear metal string complexes by inserting coins, representing suitable ligands, into the machine and selecting the desired combination of buttons, representing the metal ions.
Journal ArticleDOI
Paramagnetic Metal-Metal Bonded Heterometallic Complexes.
Jill A. Chipman,John F. Berry +1 more
TL;DR: This Review focuses in this Review on the synthetic methods employed to access multimetallic coordination complexes with heterometallic metal-metal bonds that are paramagnetic, and the magnetic properties of these compounds can be described using an extension of the Goodenough-Kanamori rules.
References
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Evaluation of Single-Crystal X-ray Diffraction Data from a Position-Sensitive Detector
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Automatic indexing of rotation diffraction patterns
TL;DR: In this article, a method for assigning indices to a set of single-crystal reflections recorded by the rotation-oscillation technique using a fixed X-ray wavelength is described.
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Exchange Coupling in Carboxylato‐Bridged Dinuclear Copper(II) Compounds: A Density Functional Study
TL;DR: Coupling constants calculated for some complete structures, as determined by X-ray diffraction, are in excellent agreement with experimental data, confirming the ability of the computational strategy used in this work to predict the coupling constant for compounds for which experimental data are not yet available.
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Linear Tricobalt Compounds with Di(2-pyridyl)amide (dpa) Ligands: Temperature Dependence of the Structural and Magnetic Properties of Symmetrical and Unsymmetrical Forms of Co3(dpa)4Cl2 in the Solid State
Rodolphe Clérac,F. Albert Cotton,Lee M. Daniels,Kim R. Dunbar,Kristin Kirschbaum,Carlos A. Murillo,A. Alan Pinkerton,and Arthur J. Schultz,Xiaoping Wang +8 more
TL;DR: The linear trinuclear compound Co3(dpa)4Cl2 (1; dpa = di(2-pyridyl)amide anion) crystallizes from CH2Cl2 solution in two forms simultaneously as mentioned in this paper.