New Multidentate Pyrazolyl - Pyridine Ligands—Synthesis and Structures

2003 ◽  
Vol 56 (7) ◽  
pp. 665 ◽  
Author(s):  
Zöe R. Bell ◽  
Jon A. McCleverty ◽  
Michael D. Ward
Keyword(s):  
Crystal Structures ◽  
Multidentate Ligands ◽  
Pyridyl Group ◽  
X Ray ◽  
Pyridine Ligands ◽  
Nitrogen Donor ◽  
Methyl Naphthalene ◽  
Methyl Benzene ◽  
Additional Nitrogen ◽  
Methyl Pyridine

Five new multidentate ligands have been prepared containing N,N-bidentate pyrazolyl–pyridine units linked to a central aromatic spacer unit. The ligands 3,3′-bis(3-{pyridin-2-yl}-pyrazol-1-yl-methyl)-p-terphenyl (1), 4,4′-bis(3-{pyridin-2-yl}-pyrazol-1-yl)biphenyl (2), and 1,8-bis(3-{pyridin-2-yl}-pyrazol-1-yl-methyl)naphthalene (3) have two bidentate arms and are therefore potentially tetradentate; 2,6-bis(3-{pyridin-2-yl}-pyrazol-1-yl-methyl)pyridine (4) has two bidentate arms with an additional nitrogen-donor in the aromatic spacer unit (a pyridyl group) and is therefore potentially pentadentate; and 1,3,5-trimethyl-2,4,6-tris(3-{pyridin-2-yl}-pyrazol-1-yl-methyl)benzene (5) has three bidentate arms and is therefore potentially hexadentate. The X-ray crystal structures of all of these ligands have been determined.

Organoamido- and Aryloxo-lanthanoids. XII. The Coordination Chemistry of Bis(2-phenylindol-1-yl)ytterbium(II), and the X-Ray Crystal Structures of Yb(pin)2(diglyme)(thf) and [Yb(pin)2(dme)]2 (pin = 2-Phenylindol-1-yl, diglyme = Bis(2-methoxyethyl) Ether, thf Equals Tetrahydrofuran, dme = 1,2-Dimethoxyethane)

1995 ◽  
Vol 48 (12) ◽  
pp. 1933 ◽  
Author(s):  
CT Abrahams ◽  
GB Deacon ◽  
CM Forsyth ◽  
WC Patalinghug ◽  
BW Skelton ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Coordination Chemistry ◽  
Crystal Structures ◽  
Coordination Polyhedron ◽  
Basal Plane ◽  
Monoclinic Space Group ◽  
Coordinate Structure ◽  
Space Group ◽  
X Ray ◽  
Nitrogen Donor

With the facile displacement being utilized of thf from Yb(pin)2(thf)4 (pin = 2-phenylindol-1-yl, thf = tetrahydrofuran) in toluene solution, the complexes Yb(pin)2(dme)2 (dme = 1,2- dimethoxyethane), Yb(pin)2 (tmen)(tmen = N,N,N′,N′-tetramethylethane-1,2-diamine) and Yb(pin)2(diglyme)(thf) (diglyme = bis(2-methoxyethyl) ether) have been prepared from the respective ligands and Yb(pin)2(thf)4. Yb(pin)2 (diglyme) (thf) [monoclinic, space group P 21 /c, a 15.35(1), b 16.179(5), c 14.45(2) Ǻ, β 107.51(8)°, Z 4, R 0.044 for 2956 (I > 3σ(I)) 'observed' reflections] has a monomeric six-coordinate structure with transoid nitrogen donor atoms, N-Yb-N 143.6(4)° and an irregular coordination polyhedron described as either a distorted trigonal prism or a monocapped square pyramid. Attempted crystallization of Yb(pin)2 (thf) by partial desolvation of Yb(pin)2(thf)4 in hot toluene, containing a trace of dme, gave a mixture of red Yb(pin)2(thf) and orange [Yb(pin)2(dme)]2. The latter was independently synthesized by partial desolvation of Yb(pin)2(dme)2 in toluene. An X-ray crystal structure showed [Yb(pin)2(dme)]2 [monoclinic, space group P 21/c, a 11 .614(2), b 15.945(7), c 15.327(4) Ǻ, β 110.19(2)°, Z 2 dimers, R 0.070 for 2314 (I ≥ 3σ(I)) 'observed' reflections] to be a dimer with two bridging pin ligands, coordinated through nitrogen only. There is an approximately square pyramidal five-coordinate ytterbium environment with an apical dme oxygen, and with two bridging nitrogens, a terminal nitrogen, and a dme oxygen in the basal plane.

Copper(II) Complexes with Tridentate Bis(pyrazolylmethyl)pyridine Ligands: Synthesis, X-ray Crystal Structures and ϵ-Caprolactone Polymerization

2017 ◽  
Vol 2 (30) ◽  
pp. 9815-9821 ◽  
Author(s):  
Juan Rueda-Espinosa ◽  
Juan F. Torres ◽  
Carmen Valdez Gauthier ◽  
Lukasz Wojtas ◽  
Gaurav Verma ◽  
...  
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Pyridine Ligands

Syntheses, Crystal Structures and Electrochemical Properties of Acetylacetonato-Ruthenium Complexes Containing Substituted Pyridine Ligands

2013 ◽  
Vol 68 (9) ◽  
pp. 993-999 ◽  
Author(s):  
Xiuli Wu ◽  
Rufei Ye ◽  
Ai-Quan Jia ◽  
Qun Chen ◽  
Qian-Feng Zhang
Keyword(s):  
Electrochemical Properties ◽  
Crystal Structures ◽  
Zinc Dust ◽  
Ruthenium Complexes ◽  
Reducing Agent ◽  
Molecular Structures ◽  
X Ray ◽  
X Ray Crystallography ◽  
Crystal And Molecular Structures ◽  
Pyridine Ligands

Treatment of Ru(acac)3 with 2-cyano-pyridine and 3,5-dimethyl-pyridine in the presence of zinc dust as reducing agent in refluxing THF afforded the ruthenium(II) complexes cis-[RuII(acac)2(2- CN-py)2] (1) and cis-[RuII(acac)2(3,5-Me2-py)2] (2), respectively. Interaction of Ru(acac)3 with 3- Me-pyridine and 3,5-Me2-pyridine in the presence of Br2 in refluxing THF gave the ruthenium(III) complexes [RuIII(acac)Br2(3-Me-py)2] (3) and [RuIII(acac)Br2(3,5-Me2-py)2] (4), respectively. The four complexes have been spectroscopically and electrochemically characterized, and their crystal and molecular structures have been established by X-ray crystallography

Cadmium–halide and mixed cadmium–halide–dicyanamide polymers mediated by ancillary 2-aminoalkyl-pyridine ligands: Synthesis, X-ray single crystal structures and luminescence property

Polyhedron ◽  
2008 ◽  
Vol 27 (11) ◽  
pp. 2452-2458 ◽  
Author(s):  
Tanmay Chattopadhyay ◽  
Arpita Banerjee ◽  
Kazi Sabnam Banu ◽  
Eringathodi Suresh ◽  
Munirathinam Netahji ◽  
...  
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Luminescence Property ◽  
X Ray ◽  
Single Crystal Structures ◽  
Pyridine Ligands

scholarly journals Modified Phenyl Groups on Pyrazin Groups to Synthesized Cobalt String Complexes

2014 ◽  
Vol 70 (a1) ◽  
pp. C1011-C1011
Author(s):  
Geng-Min Lin ◽  
Chen-Yu Yeh ◽  
Gene-Hsiang Lee ◽  
Shie-Ming Peng
Keyword(s):  
Magnetic Property ◽  
Crystal Structures ◽  
Structural Characterization ◽  
Pyridyl Group ◽  
Cobalt Ions ◽  
X Ray ◽  
X Ray Crystallography ◽  
Axial Ligands

In the literature, ligand such as oligo-α-pyridylamines and oligo-naphthyridylamine are usually used in the linear metal string complex. In addition to all of the above, another series of ligand is synthesized by mixing two types of ligands. In other words, the type of ligand contains pyridyl and naphthyridyl groups. Permuting the possible permutation, we can find that symmetrical and the shortest ligand is 2,7-bis(α-pyridylamino)-1,8-naphthyridine (H2bpyany). Complexes contain bpyany2-, hexa-nickel or hexa-cobalt, axial ligands such as chloride and thiocyanate, and anions such as hexafluorophosphate and tetrafluoroborate were published1, 2. Another similar ligand that H2bpyany replaces pyridyl groups by pyrimidyl group is 2,7-bis(α-pyrimidylamino)-1,8-naphthyridine (H2bpmany). Hexanickel complexes with bpmany2- were also published3. According to the above, if we replace pyridyl group by pyrazin group, properties of complexes such as magnetic property, CV and resistance make a change. 2,7-bis(α-pyrazinamino)-1,8-naphthyridine (H2bpzany) and nickel or cobalt ions were reacted. We can get the signal in MALDI, but we cannot isolate the target. Because of this, we modified phenyl groups on pyrazin groups. By 2,7-bis(5-phenyl)-α-pyrazinamino-1,8-naphthyridine (H2bphpzany), [Co5(bphpzany)4(NCS)2] (1), [Co6(bphpzany)4(NCS)2](PF6)n (n=1 (2), n=2 (3)) have been synthesized and the crystal structures for complex 1–3 have been determined by X-ray crystallography. Three complexes are the similar component of four ligands, five or six cobalt ions, two thiocyanates as axial ligands, and hexafluorophosphate as counterions. The structural characterization is that the cobalt chain is helically wrapped by four bphpzany2–. Complex 1–3 have Co510+, Co612+ configurations, and all are air-stable.

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