@article {3470, title = {ANTIFERROMAGNETISM AND METAMAGNETISM IN 1,4-DIAZINE AND PYRIDINE COMPLEXES OF NICKEL(II)}, journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie}, volume = {73}, number = {2}, year = {1995}, note = {ISI Document Delivery No.: QQ128Times Cited: 9Cited Reference Count: 54}, month = {Feb}, pages = {275-283}, type = {Article}, abstract = {Several nickel(II) complexes containing pyridine (py), pyrazine (pyz) or methylpyrazine (mepyz) have been synthesized and characterized by vibrational and electronic spectroscopy, differential scanning calorimetry, and magnetic susceptibility studies to cryogenic temperatures. A comparison of the magnetic properties of the polymeric diazine-bridged complexes, Ni(pyz)(2)X(2) (X = Cl or NO3), Ni(pyz)(p-CH3C6H4SO3)(2), Ni(mepyz)(NO3)(2), and Ni(pyz)(3)(CH3SO3)(2).CH3OH with those of the related monometallic systems, Ni(py)(4)X(2) (X = Cl, p-CH3C6H4SO3 or CH3SO3) and Ni(mepyz)(4)(NO3)(2).H2O provides evidence for weak antiferromagnetic coupling between metal centers mediated by bridging diazine ligands in the former group of compounds. The magnetic properties were analyzed employing a model for S = 1 which takes into account zero-field splitting and employs a molecular field term to account for weak magnetic exchange. The compounds Ni(pyz)Cl-2 and Ni(py)Cl-2, show metamagnetic behaviour with critical fields of 13 and 2 kOe, respectively, at 2 K. In these compounds nickel ions, linked in chains by bridging chlorides, exhibit intrachain ferromagnetic and interchain antiferromagnetic exchange. In Ni(pyz)Cl-2, bridging pyrazine ligands are considered to provide the pathway for the antiferromagnetic coupling resulting in a high critical field.}, keywords = {ANTIFERROMAGNETISM, BRIDGED COPPER(II) COMPLEXES, CHAIN, COMPLEXES, CRYSTAL-STRUCTURE, MAGNETIC EXCHANGE, METAMAGNETISM, MOLECULAR-STRUCTURES, NICKEL(II), polymer, Pyrazine, PYRIDINE, SUPEREXCHANGE MECHANISM, SUSCEPTIBILITY}, isbn = {0008-4042}, url = {://A1995QQ12800015}, author = {Otieno, T. and Thompson, R. C.} } @article {3534, title = {COORDINATION POLYMERS INCORPORATING WEAKLY COORDINATING FLUOROANIONS}, journal = {Journal of Fluorine Chemistry}, volume = {71}, number = {2}, year = {1995}, note = {ISI Document Delivery No.: QV343Times Cited: 1Cited Reference Count: 9George H Cady Symposium on Inorganic Chemistry, at the 207th Meeting of the American-Chemical-SocietyMAR 14-17, 1994SAN DIEGO, CAAMER CHEM SOC}, month = {Apr}, pages = {191-191}, type = {Proceedings Paper}, keywords = {ANTIFERROMAGNETIC EXCHANGE, coordination polymers, FLUOROANIONS, MAGNETIC EXCHANGE, SINGLE-CRYSTAL X-RAY DIFFRACTION, SYNTHESIS}, isbn = {0022-1139}, url = {://A1995QV34300020}, author = {Thompson, R. C.} } @article {7008, title = {METAL PYRAZOLATE POLYMERS .2. SYNTHESIS, STRUCTURE, AND MAGNETIC-PROPERTIES OF [CU(4-CL PYRAZOLATE)2)X, (CU(4-BR PYRAZOLATE)2)X, (CU(4-ME PYRAZOLATE)2)X, (CU(4-H PYRAZOLATE)2)X POLYMERS}, journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie}, volume = {69}, number = {3}, year = {1991}, note = {ISI Document Delivery No.: FE808Times Cited: 50Cited Reference Count: 16}, month = {Mar}, pages = {432-439}, type = {Article}, abstract = {{Novel and reliable methods for the synthesis of the polymers [Cu(4-Xpz)2]x (where X = H,Cl,Br, and Me; pz = pyrazolate) are presented. The X = Cl compound was obtained as green and brown forms. Single crystals of the polymers with X = Me and X = Cl (green form) suitable for X-ray analysis have been obtained. [Cu(4-Mepz)2]x and [Cu(4-Clpz)2]x are isomorphous, crystallizing with four formula units per unit-cell in the orthorhombic space group Ibam}, keywords = {COPPER(II), COPPER(II) 4-SUBSTITUTED PYRAZOLATE POLYMERS, crystal structures, MAGNETIC EXCHANGE}, isbn = {0008-4042}, url = {://A1991FE80800010}, author = {Ehlert, M. K. and Rettig, S. J. and Storr, A. and Thompson, R. C. and Trotter, J.} } @article {7008, title = {METAL PYRAZOLATE POLYMERS .2. SYNTHESIS, STRUCTURE, AND MAGNETIC-PROPERTIES OF [CU(4-CL PYRAZOLATE)2)X, (CU(4-BR PYRAZOLATE)2)X, (CU(4-ME PYRAZOLATE)2)X, (CU(4-H PYRAZOLATE)2)X POLYMERS}, journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie}, volume = {69}, number = {3}, year = {1991}, note = {ISI Document Delivery No.: FE808Times Cited: 50Cited Reference Count: 16}, month = {Mar}, pages = {432-439}, type = {Article}, abstract = {{Novel and reliable methods for the synthesis of the polymers [Cu(4-Xpz)2]x (where X = H,Cl,Br, and Me; pz = pyrazolate) are presented. The X = Cl compound was obtained as green and brown forms. Single crystals of the polymers with X = Me and X = Cl (green form) suitable for X-ray analysis have been obtained. [Cu(4-Mepz)2]x and [Cu(4-Clpz)2]x are isomorphous, crystallizing with four formula units per unit-cell in the orthorhombic space group Ibam}, keywords = {COPPER(II), COPPER(II) 4-SUBSTITUTED PYRAZOLATE POLYMERS, crystal structures, MAGNETIC EXCHANGE}, isbn = {0008-4042}, url = {://A1991FE80800010}, author = {Ehlert, M. K. and Rettig, S. J. and Storr, A. and Thompson, R. C. and Trotter, J.} } @article {7008, title = {METAL PYRAZOLATE POLYMERS .2. SYNTHESIS, STRUCTURE, AND MAGNETIC-PROPERTIES OF [CU(4-CL PYRAZOLATE)2)X, (CU(4-BR PYRAZOLATE)2)X, (CU(4-ME PYRAZOLATE)2)X, (CU(4-H PYRAZOLATE)2)X POLYMERS}, journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie}, volume = {69}, number = {3}, year = {1991}, note = {ISI Document Delivery No.: FE808Times Cited: 50Cited Reference Count: 16}, month = {Mar}, pages = {432-439}, type = {Article}, abstract = {{Novel and reliable methods for the synthesis of the polymers [Cu(4-Xpz)2]x (where X = H,Cl,Br, and Me; pz = pyrazolate) are presented. The X = Cl compound was obtained as green and brown forms. Single crystals of the polymers with X = Me and X = Cl (green form) suitable for X-ray analysis have been obtained. [Cu(4-Mepz)2]x and [Cu(4-Clpz)2]x are isomorphous, crystallizing with four formula units per unit-cell in the orthorhombic space group Ibam}, keywords = {COPPER(II), COPPER(II) 4-SUBSTITUTED PYRAZOLATE POLYMERS, crystal structures, MAGNETIC EXCHANGE}, isbn = {0008-4042}, url = {://A1991FE80800010}, author = {Ehlert, M. K. and Rettig, S. J. and Storr, A. and Thompson, R. C. and Trotter, J.} }