Search Results - "WILLETT, Roger D."

The Nature of Halogen···Halide Synthons:  Theoretical and Crystallographic Studies by Awwadi, Firas F, Willett, Roger D, Peterson, Kirk A, Twamley, Brendan

“…Two types of halogen···halide synthons are investigated on the basis of theoretical and crystallographic studies; the simple halogen···halide synthons and the…”
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Synthesis, Structure, and Magnetic Properties of [(S)-[PhCH(CH3)N(CH3)3]][Mn(CH3CN)2/3Cr(ox)3]·(CH3CN)_(solvate), a 2D Chiral Magnet Containing a Quaternary Ammonium Chiral Cation by Clemente-León, Miguel, Coronado, Eugenio, Dias, Joao C, Soriano-Portillo, Alejandra, Willett, Roger D

“…The synthesis, structure, and magnetic properties of a novel oxalate-based bimetallic magnet obtained by using the chiral…”
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The Aryl Bromine−Halide Ion Synthon and Its Role in the Control of the Crystal Structures of Tetrahalocuprate(II) Ions by Willett, Roger D, Awwadi, Firas, Butcher, Robert, Haddad, Salim, Twamley, Brendan

“…The role of the arylbromine-halide ion (C−Br···X-) synthons in the development of the supramolecular frameworks is explored in a set of six bromopyridinium…”
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Structure and Magnetism of a Spin Ladder System:  (C5H9NH3)2CuBr4 by Willett, Roger D, Galeriu, Calin, Landee, Christopher P, Turnbull, Mark M, Twamley, Brendan

“…The crystal structure of bis(cyclopentylammonium)tetrabromocuprate(II) has been determined at room temperature and at −70 °C. The room temperature structure is…”
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The Nature of Halogen⋅⋅⋅Halogen Synthons: Crystallographic and Theoretical Studies by Awwadi, Firas F., Willett, Roger D., Peterson, Kirk A., Twamley, Brendan

“…A study of the halogen⋅⋅⋅halogen contacts in organic compounds using ab initio calculations and the results of previously reported crystallographic studies…”
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Tuning Molecular Structures Using Weak Noncovalent Interactions: Theoretical Study and Structure of trans-Bis(2-chloropyridine)dihalocopper(II) and trans-Bis(3-chloropyridine)dibromocopper(II) by Awwadi, Firas, Willett, Roger D, Twamley, Brendan

“…The effect of the weak noncovalent interactions (C–H···X–Cu, C–Y···Cu, and C–Y···H–C) on the molecular structure of Cu(nYP)2X2 (where nYP denotes the…”
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Dimethylammonium Trichlorocuprate(II):  Structural Transition, Low-Temperature Crystal Structure, and Unusual Two-Magnetic Chain Structure Dictated by Nonbonding Chloride−Chloride Contacts by Willett, Roger D, Twamley, Brendan, Montfrooij, Wouter, Granroth, Garrett E, Nagler, Stephen E, Hall, Donavan W, Park, Ju-Hyun, Watson, Brian C, Meisel, Mark W, Talham, Daniel R

“…Catena(dimethylammonium-bis(μ2-chloro)-chlorocuprate), (CH3)2NH2CuCl3, forms chains of Cu2Cl6 2- bifold dimers linked along the structural chain axis by…”
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Structure of Two Azide Salts of a Copper(II) Macrocycle and Magnetic Properties of Cu(14ane)Cu(N3)4 by Woodard, Brooke, Willett, Roger D, Haddad, Salim, Twamley, Brendan, Gomez-Garcia, Carlos J, Coronado, Eugenio

“…Synthesis of azide complexes with the copper(II) macrocycle complex Cu(14ane)2+ (where 14ane = 1,4,8,11-tetraazacyclothetradecane) has yielded two compounds…”
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Polymorphism in Bis(4-dimethylamino- pyridinium)tetrachlorocuprate(II) by Haddad, Salim, Willett, Roger D

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Copper(II) salts and complexes of 2-amino-5-nitropyridine by Bellesis, Andrew G., Villani-Gale, Alexander J., Dickie, Diane A., Jasinski, Jerry P., Landee, Christopher P., Wikaira, Jan L., Willett, Roger D., Turnbull, Mark M.

“…Four new copper compounds of 2-amino-5-nitropyridine/pyridinium (5NAP/5NAPH) have been prepared and characterized: (5NAPH) 2 [CuBr 4 ], 2; (d 2 -5NAPD) 2 [CuBr…”
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Dual Behavior of Bromine Atoms in Supramolecular Chemistry: The Crystal Structure and Magnetic Properties of Two Copper(II) Coordination Polymers by Awwadi, Firas F, Willett, Roger D, Twamley, Brendan, Turnbull, Mark M, Landee, Christopher P

“…The crystal structures of two copper­(II) chloride coordination polymers, (Cu2(2bp)2Cl4)n, henceforth “polydimer”, and (Cu3(2bp)2Cl6)n, henceforth…”
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The Aryl Chlorine−Halide Ion Synthon and Its Role in the Control of the Crystal Structures of Tetrahalocuprate(II) Ions by Awwadi, Firas F, Willett, Roger D, Twamley, Brendan

“…The role of the arylchlorine−halide (C−Cl···X-) synthons in the development of crystal structures of the type (nCP)2CuX4·mH2O (nCP+ = n-chloropyridinium; n =…”
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Crystal Structures and Magnetic Properties of a Novel Layer Perovskite System:  (3-Picoliniumylammonium)CuX4 (X = Cl, Br) by Long, Greg S, Wei, Mingyi, Willett, Roger D

“…The compounds (C6N2H10)CuX4, where the cation is diprotonated 3-picolylamine and X = Cl- or Br-, form an unusual variant of the normal antiferrodistortive…”
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Strong Rail Spin 1/2 Antiferromagnetic Ladder Systems: (Dimethylammonium)(3,5-Dimethylpyridinium)CuX4, X = Cl, Br by Awwadi, Firas, Willett, Roger D, Twamley, Brendan, Schneider, Ryan, Landee, Christopher P

“…The mixed cation salts, (dimethylammonium)(3,5-dimethylpyridinium)CuX4 (X = Cl, Br), henceforth (DMA)(35DMP)CuX4, are new examples of spin-ladders based on…”
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Two-Dimensional Heisenberg Antiferromagnets:  Syntheses, X-ray Structures, and Magnetic Behavior of [Cu(pz)2](ClO4)2, [Cu(pz)2](BF4)2, and [Cu(pz)2(NO3)](PF6) by Woodward, F. Matthew, Gibson, Pamela J, Jameson, Geoffrey B, Landee, Christopher P, Turnbull, Mark M, Willett, Roger D

“…We report on the syntheses, crystal structures, and magnetic susceptibilities of a family of copper pyrazine (pz)-based antiferromagnets with moderate in-plane…”
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The Analogy of C−Br···Br−C, C−Br···Br−Fe, and Fe−Br···Br−Fe Contacts: Crystal Structures of (26DAPH)FeBr4 and (26DA35DBPH)2FeBr4·Br by Awwadi, Firas, Haddad, Salim F, Willett, Roger D, Twamley, Brendan

“…The role of C−Br1···Br2−Fe and Fe−Br1···Br2−Fe interactions in the iron(III) structures (26DAPH)FeBr4 (I) and (26DA35DBPH)2FeBr4·Br (II) (where 26DAPH is…”
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Exchange Coupling Mediated by N–H···Cl Hydrogen Bonds: Experimental and Theoretical Study of the Frustrated Magnetic System in Bis(o-phenylenediamine)nickel(II) Chloride by Willett, Roger D, Gómez-García, Carlos J, Twamley, Brendan, Gómez-Coca, Silvia, Ruiz, Eliseo

“…The title compound crystallizes in the monoclinic P21/c space group with a = 11.2470(3) Å, b = 5.9034(2) Å, c = 12.0886(3) Å, β = 115.143(1)°, and V =…”
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The Electrostatic Nature of Aryl−Bromine−Halide Synthons:  The Role of Aryl−Bromine−Halide Synthons in the Crystal Structures of the trans-Bis(2-bromopyridine)dihalocopper(II) and trans-Bis(3-bromopyridine)dihalocopper(II) Complexes by Awwadi, Firas F, Willett, Roger D, Haddad, Salim F, Twamley, Brendan

“…The role of C−Br···X synthons in the structures of Cu(nbp)2X2 (nbp = n-bromopyridine; n = 2 and 3) are investigated. A comparison of the role of these synthons…”
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Long-Range Order in Layered Perovskite Salts - Structure and Magnetic Properties of [(CH3)2CHCH2NH3]2CuX4 (X = Cl, Br) by Willett, Roger D., Gómez-García, Carlos J., Twamley, Brendan

“…The synthesis, structure, and magnetic properties of two new layered perovskite‐type copper halide salts are reported. Dominant ferromagnetic coupling is…”
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Structure and isomerization in 4,4′-biimidazoles: a comparison of crystal structures and theoretical calculations of 2,2′-dimethyl-4,4′-biimidazole and 2,2′-dimethyl-4,4′-biimidazolium bis-trifluoroactate by Zhang, Weidong, Landee, Christopher P, Willett, Roger D, Turnbull, Mark M

“…The crystal structures of the compounds 2,2′-dimethyl-4,4′-biimidazole dihydrate ( 1 ) and 2,2′-dimethyl-4,4′-biimidazolium bistrifluoroacetate ( 2 ) have been…”
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