@article { ISI:000351442700019,
	title = {A New Side-on End-On Ditantalum Dinitrogen Complex and Its Reaction with BuSiH3},
	journal = {Zeitschrift f{\"u}r anorganische und allgemeine Chemie},
	volume = {641},
	number = {1, SI},
	year = {2015},
	month = {JAN},
	pages = {123-127},
	publisher = {WILEY-V C H VERLAG GMBH},
	address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY},
	abstract = {<p>The formation of the P-cyclohexyl dinitrogen complex, (CyPh{[}NPN]Ta)(2)(mu-eta(2):eta(1)-N-2)(mu-H)(2) ((CyPh){[}NPN] = {[}CyP(CH2SiMe2NPh)(2)], and Cy = C6H11) is described and its reaction with butylsilane (BuSiH3) explored. The reaction was monitored by multinuclear NMR spectroscopy and showed the formation of a number of intermediates. The final product is a hydride-bridged imidoamido silyated species that has the imido bridging between the two central tantalum atoms. The origin of the bridging hydrides in the product is likely to arise from the excess silane present, on the basis of labeling studies.</p>},
	keywords = {DINITROGEN, DINUCLEAR, Hydride route, HYDROSILYLATION, tantalum},
	issn = {0044-2313},
	doi = {10.1002/zaac.201400167},
	author = {Yeo, Alyssa and Shaver, Michael P. and Fryzuk, Michael D.}
}
@article {1185,
	title = {Functionalization and cleavage of coordinated dinitrogen via hydroboration using primary and secondary boranes},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {83},
	number = {4},
	year = {2005},
	note = {ISI Document Delivery No.: 921DLTimes Cited: 14Cited Reference Count: 30},
	month = {Apr},
	pages = {315-323},
	type = {Article},
	abstract = {The reaction of the side-on, end-on ditantalum dinitrogen complex ([NPN]Ta)(2)(mu-eta(1):eta(2)-N-2)(mu-H)(2) (where NPN = PhP(CH2SiMe2NPh)(2)) with a variety of secondary and primary boranes is reported. With 9-BBN, hydroboration of the Ta2N2 unit occurs via B-H addition, which in turn triggers a cascade of reactions that result in N-N bond cleavage, ancillary ligand rearrangement involving silicon group migration, and finally elimination of benzene from the N-Ph group and a B-H moiety to generate the imide-nitride derivative. In the presence of excess 9-BBN, the Lewis acid - base adduct of the imide-nitride ([NP mu-N]Ta(=NBC8H14)(mu-NB(H)C8H14)Ta[NPN]) is formed. A similar set of reactions is observed for dicyclohexylborane (Cy2BH), which hydroborates the dinitrogen complex to generate [NPN]Ta(H)(mu-eta(1):eta(2)-NNBCy2)(mu-H)(2)Ta[NPN], followed by loss of H-2 and silicon group migration to yield the imide-nitride [NP mu-N]Ta(=NBCy2)(mu-N)(Ta[NPN]. With thexyl borane (H2BCMe2CHMe2), a similar sequence of reactions is suggested starting with hydroboration to generate [NPN]Ta(H)(mu-eta(1):eta(2)-NNB(H)C6H13)(mu-H)(2)Ta[NPN], followed by loss of H-2 and ancillary ligand rearrangement. When bis(pentafluorophenyl)borane (HB(C6F5)(2)) is used, no hydroboration of coordinated N-2 is observed, rather simple adduct formation to give ([NPN]Ta)(2)(mu-eta(1):eta(2)-NN-B(H)(C6F5)(2))(mu-H)(2) occurs.},
	keywords = {ACTIVATION, ammonia, CHEMISTRY, DINITROGEN, END-ON, FIXATION, hydroboration, METAL-COMPLEXES, MOLECULAR NITROGEN, MOLYBDENUM, N-2, N-N bond cleavage, SIDE-ON, tantalum},
	isbn = {0008-4042},
	url = {<Go to ISI>://000228744300008},
	author = {MacKay, B. A. and Johnson, S. A. and Patrick, B. O. and Fryzuk,Michael D.}
}
@article {1270,
	title = {Lewis adducts of the side-on end-on dinitrogen-bridged complex [{(NPN)Ta}(2)(mu-H)(2)(mu-eta(1):eta(2)-N-2)] with AlMe3, GaMe3, and B(C6F5)(3): Synthesis, structure, and spectroscopic properties},
	journal = {Chemistry-a European Journal},
	volume = {11},
	number = {2},
	year = {2005},
	note = {ISI Document Delivery No.: 887VLTimes Cited: 12Cited Reference Count: 49},
	month = {Jan},
	pages = {604-618},
	type = {Article},
	abstract = {{Reaction of the side-on end-on dinitrogen complex [{(NPN)Ta}(2)(mu- H)(2)(mu-eta(1):eta(2)-N-2)] (1; in which NPN= (PhNSiMe2CH2)(2)PPh), with the Lewis acids XR3 results in the adducts [{(NPN)Ta}(2)(mu-H)(2)(mu-eta(1):eta(2)-NNXR3)]},
	keywords = {CHEMISTRY, CLEAVAGE, COORDINATED, density functional calculations, DINITROGEN, DINITROGEN COMPLEXES, DINUCLEAR TANTALUM COMPLEX, EFFECTIVE CORE POTENTIALS, FIXATION, MOLECULAR CALCULATIONS, MOLYBDENUM CENTER, N-2 LIGAND, NITROGEN, Raman spectroscopy, REACTIVITY, tantalum, TRIS(PENTAFLUOROPHENYL)BORANE},
	isbn = {0947-6539},
	url = {<Go to ISI>://000226333500014},
	author = {Studt, F. and MacKay, B. A. and Johnson, S. A. and Patrick, B. O. and Fryzuk,Michael D. and Tuczek, F.}
}
@article {615,
	title = {Activation and functionalization of molecular nitrogen by metal complexes},
	journal = {Chemical Record},
	volume = {3},
	number = {1},
	year = {2003},
	note = {ISI Document Delivery No.: 669WPTimes Cited: 48Cited Reference Count: 52},
	pages = {2-11},
	type = {Article},
	abstract = {Molecular nitrogen is intrinsically unreactive, so much so that it has confounded chemists for decades in attempts to functionalize this abundant diatomic molecule. While biological systems and industrial processes can fix nitrogen to form ammonia, the challenge is to discover a process that involves a homogeneous catalyst that can utilize N-2 as a feedstock to generate higher value organonitrogen materials. In this review, the activation of molecular nitrogen by transition metal complexes is reviewed with the view to present new kinds of transformations for coordinated dinitrogen. Moreover, some reaction types that are as yet unknown are outlined to try and stimulate further research in this area. (C) 2003 The Japan Chemical Journal Forum and Wiley Periodicals, Inc.},
	keywords = {BRIDGING N-2 UNIT, CHEMISTRY, COORDINATED, COORDINATION CHEMISTRY, CRYSTAL-STRUCTURE, DINITROGEN, DINITROGEN COMPLEXES, END-ON, FIXATION, nitrogen fixation, nitrogenase, REDUCTION, SIDE-ON, transition metal complexes, ZIRCONIUM},
	isbn = {1527-8999},
	url = {<Go to ISI>://000182373700001},
	author = {Fryzuk,Michael D.}
}
@article {616,
	title = {Reduction of hafnium(IV) complexes in the presence of molecular nitrogen: Attempts to form dinitrogen complexes of the heaviest group 4 element},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {81},
	number = {11},
	year = {2003},
	note = {ISI Document Delivery No.: 746YXTimes Cited: 10Cited Reference Count: 28},
	month = {Nov},
	pages = {1376-1387},
	type = {Article},
	abstract = {The reaction of [P2N2]Li-2(dioxane)(2) with HfCl4(THF)(2) (where [P2N2] = PhP(CH2SiMe2NSiMe2CH2)(2)PPh) results in the formation of the hafnium dichloride complex [P2N2]HfCl2 (1). The behaviour of 1 as a potential precursor in the generation of a dinitrogen coordination complex is described. Reduction of 1 with potassium-graphite (C8K), under dinitrogen, under a variety of conditions led to a number of products, one of which is the dinuclear derivative with bridging P-phenyl groups that has the general formula {[P2N2]Hf}(2) (2). Reduction of the hafnium diiodide [P2N2]HfI2 (3) - prepared via the reaction of 1 with excess Me3SiI - with C8K results in the formation of ([P2N2]Hf)(2)(mu-eta(2):eta(2)-N-2) (4) as the major product of the reaction, while {[P2N2]Hf}(2) (2) and [P2N2]Hf(C7H8) (5) appear to be minor products. Reaction of 1 with 2 equiv of MeMgCl gives [P2N2]HfMe2 (6), which, upon exposure to an atmosphere of H-2, gives the hafnium tetrahydride {[P2N2]Hf}(2)(m-H)(4) (7).},
	keywords = {COORDINATION CHEMISTRY, DERIVATIVES, DINITROGEN, donor ligands, FLUXIONAL BEHAVIOR, hafnium, hydride, macrocycle, mixed, {ALKYL},
	isbn = {0008-4042},
	url = {<Go to ISI>://000186777600031},
	author = {Fryzuk,Michael D. and Corkin, J. R. and Patrick, B. O.}
}
@article {380,
	title = {Hydroboration of coordinated dinitrogen: A new reaction for the N-2 ligand that results in its functionalization and cleavage},
	journal = {Angewandte Chemie-International Edition},
	volume = {41},
	number = {19},
	year = {2002},
	note = {ISI Document Delivery No.: 604GZTimes Cited: 48Cited Reference Count: 30},
	pages = {3709-3712},
	type = {Article},
	keywords = {ACTIVATION, COMPLEX, DINITROGEN, END-ON, EXCHANGE, hydroboration, iron, MILD CONDITIONS, nitrides, NITROGEN, nitrogen fixation, REDUCTION, SIDE-ON, tantalum, TUNGSTEN},
	isbn = {1433-7851},
	url = {<Go to ISI>://000178609900046},
	author = {Fryzuk,Michael D. and MacKay, B. A. and Johnson, S. A. and Patrick, B. O.}
}
@article {378,
	title = {Nitride formation by thermolysis of a kinetically stable niobium dinitrogen complex},
	journal = {Journal of the American Chemical Society},
	volume = {124},
	number = {28},
	year = {2002},
	note = {ISI Document Delivery No.: 573QWTimes Cited: 46Cited Reference Count: 58},
	month = {Jul},
	pages = {8389-8397},
	type = {Article},
	abstract = {The reduction of [P2N2]NbCl (where [P2N2] = PhP(CH2SiMe2NSiMe2CH2)(2)PPh) with KC8 under a dinitrogen atmosphere generates the paramagnetic dinuclear dinitrogen complex ([P2N2]Nb)(2)(mu-N-2) (2). Complex 2 has been characterized crystallographically and by EPR spectroscopy. Variable-temperature magnetic susceptibility measurements indicate that 2 displays antiferromagnetic coupling between two Nb(IV) (d(1)) centers. A density functional theory calculation on the model complex [(PH3)(2)(NH2)(2)Nb](2)(mu-N-2) was performed. Thermolysis of ([P2N2]Nb)(2)(mu-N-2) in toluene generates the paramagnetic bridging nitride species where one N atom of the dinitrogen ligand inserts into the macrocycle backbone to form [P2N2]Nb(mu-N)Nb[PN3] (3) (where [PN3] = PhPMe(CHSiMe2NSiMe2CH2P(Ph)CH2SiMe2NSiMe2N)). Complex 3 has been characterized in the solid state as well as by variable-temperature magnetic susceptibility measurements. The reaction of ([P2N2]Nb)(2)(mu-N-2) with phenylacetylene displaces the dinitrogen fragment to generate a paramagnetic eta(2)-alkyne complex, [P2N2]Nb(eta(2)-HCCPh) (4).},
	keywords = {BRIDGING DINITROGEN, COORDINATED, DINITROGEN, END-ON, METAL-METAL BOND, MOLECULAR-STRUCTURE, {3-COORDINATE MOLYBDENUM(III)},
	isbn = {0002-7863},
	url = {<Go to ISI>://000176843200034},
	author = {Fryzuk,Michael D. and Kozak, C. M. and Bowdridge, M. R. and Patrick, B. O. and Rettig, S. J.}
}
@article {379,
	title = {Phosphorus phenyl-group activation by reduced zirconium and niobium complexes stabilized by the [P2N2] macrocycle},
	journal = {Journal of the American Chemical Society},
	volume = {124},
	number = {4},
	year = {2002},
	note = {ISI Document Delivery No.: 514THTimes Cited: 21Cited Reference Count: 23},
	month = {Jan},
	pages = {516-517},
	type = {Article},
	keywords = {ARENE COMPLEX, CHEMISTRY, CRYSTAL, DERIVATIVES, DINITROGEN, LIGAND, REACTIVITY, TITANIUM},
	isbn = {0002-7863},
	url = {<Go to ISI>://000173456800002},
	author = {Fryzuk,Michael D. and Kozak, C. M. and Mehrkhodavandi, Parisa and Morello, L. and Patrick, B. O. and Rettig, S. J.}
}
@article {5074,
	title = {Carbon-carbon bond formation using yttrium(III) and the lanthanide elements},
	journal = {Organometallics},
	volume = {20},
	number = {7},
	year = {2001},
	note = {ISI Document Delivery No.: 416YATimes Cited: 39Cited Reference Count: 44},
	month = {Apr},
	pages = {1387-1396},
	type = {Article},
	abstract = {The synthesis and characterization of a series of yttrium and lanthanide complexes that incorporate the macrocyclic bis(amidophosphine) ligand PhP(CH2SiMe2NSiMe2CH2)(2)PPh, [P2N2], are described. The starting materials, {[P2N2]M}(2)(mu -Cl)(2), (M = Y, Sm, Ho, Yb, Lu), are prepared by the reaction of syn-Li-2(dioxane)[P2N2] with MCl3(THF)(3) in toluene. The reactivity of these complexes toward PhLi and other arylating agents is dependent on the size of the M3+ ion. M = Y and Ho undergo C-C bond formation reactions to give biphenyldiide compounds {[P2N2]M}(2){mu-eta (6):eta (6 {\textquoteright})-(C6H5)(2)} and {[P2N2]Y}(2){mu-eta (6):eta (6 {\textquoteright})-(C6H4-p-Ph)(2)} These have been structurally characterized and show the biphenyl dianion bridging two [P2N2]M fragments. These [P2N2]M fragments migrate over the bridging ligand{\textquoteright}s pi -surface on the NMR time scale. M = Yb yields the paramagnetic monophenyl derivative [P2N2]Yb-(C6H5), where the Yb center is coordinatively unsaturated and resides in a distorted square-pyramidal environment. M = Lu results in a mixture of "ate" complexes of the formulation "[P2N2]LuPh . LiCl", as evidenced by Li-7 NMR. However, the biphenyl product {[P2N2]Lu}(2)-{mu-eta (6):eta (6 {\textquoteright})-(C6H5)(2)} can be synthesized via a reductive route. The presence of THF was found to be deleterious to the coupling reaction; in this case, the THF adduct [P2N2]Y(C6H4-p-Me)-(THF) was isolated and structurally characterized. The mechanism for the C-C bond formation reaction is described based on the isolation of these yttrium and lanthanide complexes.},
	keywords = {CATALYSTS, CHEMISTRY, COMPLEXES, DINITROGEN, {BRIDGING N-2 UNIT},
	isbn = {0276-7333},
	url = {<Go to ISI>://000167807000019},
	author = {Fryzuk,Michael D. and Jafarpour, L. and Kerton, F. M. and Love, J. B. and Patrick, B. O. and Rettig, S. J.}
}
@article {5078,
	title = {Synthesis, structure, and reactivity of diamidophosphine complexes of yttrium and the lanthanides},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {79},
	number = {7},
	year = {2001},
	note = {ISI Document Delivery No.: 473RETimes Cited: 10Cited Reference Count: 17},
	month = {Jul},
	pages = {1194-1200},
	type = {Article},
	abstract = {The reaction of the dilithiodiamidophosphine ligand precursor PhP(CH2SiMe2NPh)(2)Li-2(THF)(2)([NPN]Li-2(THF)(2)) with LnCl(3)(THF)(3) (Ln = Y, Sm, Ho. Yb. Lu; THF = tetrahydrofuran) in refluxing toluene generates the mononuclear complexes [NPN]LnCI(THF) in good yield. The molecular structures have been shown to be five-coordinate in the solid state and in solution. Attempts to prepare alkyl derivatives have only met with partial success; the reaction of MeMgCl with [NPN]YCl(THF) generates the partially characterized mixed-metal derivative [NPN]YMe2MgCl. The reaction with LiAlH4 results in complete ligand exchange and the formation of the tetranuclear lithium aluminum hydride derivative ([NPN]AlH2Li(THF))(2). Reduction of the lutetium derivative with KC8 and naphthalene generated the dinuclear naphthalene-bridged species {[NPN]Lu}(2)(mu-eta (4):eta (4)-C10H8) wherein each Lu centre engages in eta (4)-coordination to opposite sides of the arene moiety. X-ray crystallography was used to characterize the four complexes.},
	keywords = {aluminum, BRIDGING N-2 UNIT, CATALYSTS, CRYSTAL-STRUCTURE, DINITROGEN, F-BLOCK METALS, lanthanides, LIGAND, lithium, mixed-donor ligands, NAPHTHALENE, OLEFIN POLYMERIZATION, SIDE-ON, TERTIARY PHOSPHINE COMPLEXES, YTTRIUM},
	isbn = {0008-4042},
	url = {<Go to ISI>://000171061200016},
	author = {Fryzuk,Michael D. and Yu, P. H. and Patrick, B. O.}
}
@article {4809,
	title = {The continuing story of dinitrogen activation},
	journal = {Coordination Chemistry Reviews},
	volume = {200},
	year = {2000},
	note = {ISI Document Delivery No.: 345HCTimes Cited: 235Cited Reference Count: 121},
	month = {May},
	pages = {379-409},
	type = {Review},
	abstract = {This review attempts to survey the recent literature concerning the coordination chemistry and the reactivity patterns of metal-dinitrogen complexes. In order that this work may stand alone, a certain amount of background information is included; however, the emphasis is on synthesis and reactivity patterns of recently discovered dinitrogen complexes. In addition, some effort is made to discuss new trends in dinitrogen chemistry as well as to point out underdeveloped topics in this area. (C) 2000 Elsevier Science S.A. All rights reserved.},
	keywords = {(1-PYRIDINIO)IMIDO, 3-COORDINATE MOLYBDENUM(III) COMPLEXES, BRIDGING N-2 UNIT, COMPLEXES, COORDINATED DINITROGEN, DINITROGEN, metal complexes, MOLECULAR, N BOND-CLEAVAGE, NITROGEN, nitrogen fixation, nitrogenase, RAY CRYSTAL-STRUCTURES, SIDE-ON, TO-END ROTATION, TRIAMIDOAMINE COMPLEXES},
	isbn = {0010-8545},
	url = {<Go to ISI>://000088809700013},
	author = {Fryzuk,Michael D. and Johnson, S. A.}
}
@article {4810,
	title = {Synthesis and bonding in the diamagnetic dinuclear tantalum(IV) hydride species ([P2N2]Ta)(2)(mu-H)(4) and the paramagnetic cationic dinuclear hydride species {([P2N2]Ta)(2)(mu-H)(4)}I-+(-) ([P2N2] = PhP(CH2SiMe2NSiMe2CH2)(2)PPh): The reducing ability of},
	journal = {Organometallics},
	volume = {19},
	number = {19},
	year = {2000},
	note = {ISI Document Delivery No.: 355PGTimes Cited: 20Cited Reference Count: 48},
	month = {Sep},
	pages = {3931-3941},
	type = {Article},
	abstract = {The controlled reaction of the Ta(V) trimethyl species [P2N2]TaMe3, where [P2N2] = PhP(CH2SiMe2NSiMe2CH2)(2)PPh, under 0.5 atm of hydrogen gas produces a partially hydrogenated Ta(V) species, [P2N2]TaMe2(H), of unknown structure. Under 4 atm of hydrogen gas, further hydrogenation does not produce the complex [P2N2]TaH3; instead, reduction of the tantalum center occurs to yield the dinuclear Ta(IV) hydride ([P2N2]Ta)(2)-(mu-H)(4). This diamagnetic tetrahydride fails to react with many reagents, including ethylene and carbon monoxide; however, upon addition of iodomethane, {([P2N2]Ta)(2)(mu-H)(4)}I-+(-) is produced as a paramagnetic green crystalline solid. The number of hydrides in this reaction product was confirmed by a deuterium labeling study. The results of a variable-temperature magnetic susceptibility study of this tetrahydride cation can be partially modeled with the Curie-Weiss law and a large correction for temperature-independent magnetism. Ab initio calculations using density functional theory were performed in an attempt to further understand the influence of the macrocyclic ligand in the bonding in these complexes.},
	keywords = {bridging ligands, COMPLEXES, COORDINATION, CRYSTAL, DENSITY-FUNCTIONAL THEORY, DIHYDROGEN, DINITROGEN, MOLECULAR-STRUCTURES, NEUTRON-DIFFRACTION, TA-TA BOND},
	isbn = {0276-7333},
	url = {<Go to ISI>://000089393600025},
	author = {Fryzuk,Michael D. and Johnson, S. A. and Rettig, S. J.}
}
@article {7230,
	title = {THE 1992 ALCAN AWARD LECTURE EXCURSIONS AROUND THE PERIODIC-TABLE - LIGAND DESIGN IN INORGANIC-CHEMISTRY},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {70},
	number = {12},
	year = {1992},
	note = {ISI Document Delivery No.: KL565Times Cited: 56Cited Reference Count: 38},
	month = {Dec},
	pages = {2839-2845},
	type = {Article},
	abstract = {An overview is given on the strategy used to come up with the design of a new type of ligand that is appropriate for coordination to both the late metals and the early metals. The coordination chemistry of the potentially tridentate ligand -N(SiMe2CH2PR2)2 is developed starting with the Ni triad and then the heavier members of group 9, namely rhodium and iridium. It is with iridium that reactive fragments such as methylene and vinylidene have been stabilized and their chemistry examined. Extension to groups 3, 4, and the lanthanides is also discussed. With these elements, phosphine coordination imparts new reactivity patterns such as alkane elimination with group 3 and dinitrogen activation with group 4. In addition, the side-on binding mode for N2 attached to a dinuclear zirconium system is also presented.},
	keywords = {asymmetric synthesis, CARBON BOND FORMATION, DERIVATIVES, DINITROGEN, FLUXIONAL BEHAVIOR, HAFNIUM(IV), hydride, MULTI-DENTATE LIGANDS, PHOSPHINE COMPLEXES, RAY CRYSTAL-STRUCTURE},
	isbn = {0008-4042},
	url = {<Go to ISI>://A1992KL56500001},
	author = {Fryzuk,Michael D.}
}
@article {7231,
	title = {PHOSPHINE COMPLEXES OF ZIRCONIUM AND HAFNIUM - SYNTHESIS, STRUCTURE, AND FLUXIONAL BEHAVIOR OF THE TRIMETHYL DERIVATIVES MME3[N(SIME2CH2PR2)2] (R = ME, ISO-PR, TERT-BU) - EVIDENCE FOR A BICAPPED-TETRAHEDRAL GEOMETRY},
	journal = {Organometallics},
	volume = {11},
	number = {1},
	year = {1992},
	note = {ISI Document Delivery No.: GZ040Times Cited: 17Cited Reference Count: 31},
	month = {Jan},
	pages = {469-472},
	type = {Note},
	abstract = {The addition of 3 equiv of methyl Grignard (MeMgCl) to the amidodiphosphine derivatives MCl3[N-(SiMe2CH2PR2)2] (M = Zr, Hf; R = Me, Pr(i), Bu(t)) generates the corresponding trimethyl complexes MMe3[N-(SiMe2CH2PR2)2]. The solution structures and fluxional behavior of these molecules along with the X-ray structure of HfMe3[N(SiMe2CH2PMe2)2] are presented.},
	keywords = {ALKYL, CARBON BOND, DINITROGEN, ETHYLENE POLYMERIZATION, GROUP-4, HYDRIDE DERIVATIVES, INSERTION, RAY CRYSTAL-STRUCTURE, REDUCTION, TITANIUM},
	isbn = {0276-7333},
	url = {<Go to ISI>://A1992GZ04000078},
	author = {Fryzuk,Michael D. and Carter, A. and Rettig, S. J.}
}
