Crystal Structure and Spectroscopic and Magnetic Properties of Two cis-Azido Catenas of Nickel(II): cis-catena-(.mu.-N3)[Ni(bipy)2](X) (X = ClO4, PF6)

Cortés, Roberto; Urtiaga, M. Karmele; Lezama, Luís; Pizarro, José L.; Goñi, Aintzane; Arriortua, Marı́a I.; Rojo, Teófilo

doi:10.1021/ic00096a027

Cited by 80 publications

(28 citation statements)

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“…The NiÐN bipy bond distances [mean value 2.068 (3) A Ê ] are slightly shorter than the NiÐO water bond length [2.086 (3) A Ê ]. The NÐNiÐN bite angles [79.04 (12) and 79.21 (12) ] agree well with those reported previously for other nickel(II) complexes containing bipy (Wada et al, 1976;Corte Â s et al, 1994;Roma Â n et al, 1995;Herna Â ndez-Molina et al, 1999). As expected, both bipy ligands are nearly planar [the largest deviation from their mean planes is 0.069 (4) A Ê for C10], the certain degree of twisting of the pyridyl rings in the bipy ligands relative to each other [in the title compound, the twist angles are 5.1 (2) and 2.1 (2) for N1/N2/C1±C10 and N3/N4/C11±C20, respectively] is perfectly normal; angles up to 18 have been observed previously (Cano et al, 1994).…”

Section: Commentsupporting

confidence: 88%

cis-Aquabis(2,2′-bipyridine-N,N′)[dichromato(2–)-O¹]nickel(II)

et al. 2000

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The molecular structure of the title compound, [Ni(C10H8N2)2(H2O){Cr2O7}], contains an NiII atom with a distorted cis‐octahedral coordination formed by two chelating bipyridine (bipy) ligands [mean Ni—Nbipy = 2.068 (3) Å], one water molecule [Ni—O = 2.086 (3) Å] and an O atom of the dichromate anion [Ni—O = 2.083 (2) Å]. One of the water H atoms is involved in the intramolecular hydrogen bond with the terminal O atom of the dichromate ligand [O⋯O 2.743 (5) Å], whereas its second H atom participates in the intermolecular hydrogen bonding [O⋯O 2.688 (4) Å]; the latter is responsible for the formation of the infinite chains stretching along the polar c axis of the crystal.

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Section: Commentsupporting

confidence: 88%

cis-Aquabis(2,2′-bipyridine-N,N′)[dichromato(2–)-O¹]nickel(II)

et al. 2000

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“…However, the use of two bidentate aromatic ligands such as 2,2'-bipyridine gave good results. In this way, the first Ni(II)-bipy cw-azido chain structures were obtained in the [Ni(N 3 )(bipy) 2 ]Y (Y= C10 4 , PF 6 ) compounds (15). Such a conformation was strongly favored by the cis positioning of the bipy ligands, owing to their steric crowding.…”

Section: Q-|-i-i-i-i-i-i-i-i-i-|-i-i-i-i-i-i-i-i-i-|-i-i-i-i-i-i-i-i-rmentioning

confidence: 98%

The Azido Ligand: A Useful Bridge for Designing High-Dimensional Magnetic Systems

Cortés

Lezama

Mautner

et al. 1996

ACS Symposium Series

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Designing new high-dimensional magnetic molecular systems built from coordination compounds has recently been a point of attention for inorganic chemists. The variety of coordination chemistry provides the synthesizers with a useful tool to build magnetic molecular architectures interesting for their properties, which arise from the interaction among their subunits. Strategies based on the reaction of appropriate terminal and bridging ligands with paramagnetic metal ions allow the preparation of oligomeric species whose nuclearity and magnetic properties may, in any sense, be tailored (1). By using good superexchange bridging groups such as oxalate or cyanide, extended lattices of antiferromagnetic or ferrimagnetic systems which show magnetic order at low temperatures have been achieved (2,3). In this way, the azido ligand represents a good choice for the design of new magnetic systems. This ligand is able to give ferromagnetic exchange interactions (through its end-on (EO) coordination mode) and antiferromagnetic ones (through the end-to-end (EE) mode). It is also important to note the great versatility in their coordination modes, giving rise to high nuclearity systems. The Scheme shows the different bridging modes actually observed for this ligand.Former studies carried out for the azido ligand led to dinuclear entities, generally doubly bridged in the end-to-end form (4,5). More unusual end-on mode was obtained in some copper(II) dinuclear systems (6). Our preliminary work in this field was done with the aim of obtaining compounds exhibiting the unusual end-on bridging mode. From those previous studies, we have been searching for a continuous increase in the dimensionality of the prepared compounds in order to study their magneto-structural correlations. In this chapter we report the most significant structural and magnetic results obtained by our group for dinuclear, one-, two-, and three-dimensional systems.

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“…These complexes have specific coordination sites available for ligands from other building units located at appropriate angles to "direct" the formation of desired supramolecular structures. For instance, cis-[Ni(bpy) 2 (µ 1,3 -N 3 )](PF 6 ) [12] and trans-[Ni(N-Eten) 2 (µ 1,3 -N 3 )](PF 6 ) [13] have been used to prepare 1D coordination polymers with different structural features because of different angles between the two coordination sites available for the incoming azide ligand. Similar strategies have been developed for metal clusters where sitedifferentiated clusters [Re 6 Se 8 (PEt 3 ) n (MeCN) 6-n ] 2+ have been used as building units of supramolecular assemblies.…”

Section: Synthetic Strategymentioning

confidence: 99%

Octahedral Metal Clusters [Nb₆Cl₁₂(CN)₆]^4– as Molecular Building Blocks: From Supramolecular Assemblies to Coordination Polymers

Zhou

Lachgar

2007

Eur J Inorg Chem

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There are considerable advantages for using metal clusters as building units of supramolecular materials because of their unique structural, chemical, and physical properties, all of which fall in between normal valence compounds and the metals. In this microreview, we describe the synthetic methodology and structural properties of recent findings in the use of octahedral niobium hexacyanochloride anions as building units of assemblies of different size, charge, and dimensionality. We focus on the use of a metal-directed approach to prepare cluster-based supramolecular assemblies

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Crystal Structure and Spectroscopic and Magnetic Properties of Two cis-Azido Catenas of Nickel(II): cis-catena-(.mu.-N3)[Ni(bipy)2](X) (X = ClO4, PF6)

Cited by 80 publications

References 1 publication

cis-Aquabis(2,2′-bipyridine-N,N′)[dichromato(2–)-O¹]nickel(II)

cis-Aquabis(2,2′-bipyridine-N,N′)[dichromato(2–)-O¹]nickel(II)

The Azido Ligand: A Useful Bridge for Designing High-Dimensional Magnetic Systems

Octahedral Metal Clusters [Nb₆Cl₁₂(CN)₆]^4– as Molecular Building Blocks: From Supramolecular Assemblies to Coordination Polymers

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Crystal Structure and Spectroscopic and Magnetic Properties of Two cis-Azido Catenas of Nickel(II): cis-catena-(.mu.-N3)[Ni(bipy)2](X) (X = ClO4, PF6)

Cited by 80 publications

References 1 publication

cis-Aquabis(2,2′-bipyridine-N,N′)[dichromato(2–)-O1]nickel(II)

cis-Aquabis(2,2′-bipyridine-N,N′)[dichromato(2–)-O1]nickel(II)

The Azido Ligand: A Useful Bridge for Designing High-Dimensional Magnetic Systems

Octahedral Metal Clusters [Nb6Cl12(CN)6]4– as Molecular Building Blocks: From Supramolecular Assemblies to Coordination Polymers

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cis-Aquabis(2,2′-bipyridine-N,N′)[dichromato(2–)-O¹]nickel(II)

cis-Aquabis(2,2′-bipyridine-N,N′)[dichromato(2–)-O¹]nickel(II)

Octahedral Metal Clusters [Nb₆Cl₁₂(CN)₆]^4– as Molecular Building Blocks: From Supramolecular Assemblies to Coordination Polymers