Coordination studies of copper(II), cobalt(II) and iron(II) with isomeric pyridyl-tetrazole ligands

Andrew D. Bond; Adrienne Fleming; Jackie Gaire; Fintan Kelleher; John McGinley; Vickie McKee; Ursula Sheridan

doi:10.1016/j.poly.2011.11.038

Coordination studies of copper(II), cobalt(II) and iron(II) with isomeric pyridyl-tetrazole ligands

Andrew D. Bond
, Adrienne Fleming
, Jackie Gaire
, Fintan Kelleher
, John McGinley
, Vickie McKee
, Ursula Sheridan

School of Chemical and BioPharmaceutical Science

Research output: Contribution to journal › Article › peer-review

Abstract

The reaction of 2-(2H-tetrazol-5-yl)pyridine (L1) with 1,6-dibromohexane results in formation of the isomers 2-(6″-bromohexyl)-(1-tetrazol-5-yl) pyridine (L2) and 2-(6″-bromohexyl)-(2-tetrazol-5-yl)pyridine (L3). Coordination reactions of L2 and L3 with CuCl ₂·2H ₂O, Co(SCN) ₂ and Fe(ClO ₄) ₂· H ₂O yielded the strongly coloured solids [Cu(II)(L2)Cl ₂] ₂ (1), [Cu(II)(L3)Cl ₂] ₂ (2), [Co(II)(L2) ₂(NCS) ₂] (3), [Co(II)(L3) ₂(NCS) ₂] (4), [Fe(II)(L2) ₂(H ₂O) ₂](ClO ₄) ₂ (5) and [Fe(II)(L3) ₂(H ₂O) ₂](ClO ₄) ₂ (6), containing high-spin metal centres for the Co(II) and Fe(II) compounds. X-ray crystal structures were obtained for complexes 1-5. In each complex, ligands L2 and L3 coordinate to the metal centre through the pyridyl N atom and the 1-N site of the tetrazole ring, and the pyridyl-tetrazole ligand remains planar in all cases except 3. Complexes 1 and 2 comprise a central Cu ₂Cl ₂ dimeric core with Cu(II) in an essentially square-pyramidal coordination environment. Complexes 3 and 4 contain Co(II) in a distorted octahedral coordination environment. In 3, the pyridyl and tetrazole rings of L2 are twisted with respect to each other and the complex adopts a puckered conformation in its equatorial plane. Complex 5 contains water molecules coordinated to Fe(II) in the axial sites, which form hydrogen bonds to the perchlorate counter anions.

Original language	English
Pages (from-to)	289-296
Number of pages	8
Journal	Polyhedron
Volume	33
Issue number	1
DOIs	https://doi.org/10.1016/j.poly.2011.11.038
Publication status	Published - 9 Feb 2012

Keywords

Coordination chemistry
Pyridyl-tetrazole ligand
Transition metal
X-ray crystal structures

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10.1016/j.poly.2011.11.038

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@article{3664621163cd4427ba9c2661f17053b9,

title = "Coordination studies of copper(II), cobalt(II) and iron(II) with isomeric pyridyl-tetrazole ligands",

abstract = "The reaction of 2-(2H-tetrazol-5-yl)pyridine (L1) with 1,6-dibromohexane results in formation of the isomers 2-(6″-bromohexyl)-(1-tetrazol-5-yl) pyridine (L2) and 2-(6″-bromohexyl)-(2-tetrazol-5-yl)pyridine (L3). Coordination reactions of L2 and L3 with CuCl 2·2H 2O, Co(SCN) 2 and Fe(ClO 4) 2· H 2O yielded the strongly coloured solids [Cu(II)(L2)Cl 2] 2 (1), [Cu(II)(L3)Cl 2] 2 (2), [Co(II)(L2) 2(NCS) 2] (3), [Co(II)(L3) 2(NCS) 2] (4), [Fe(II)(L2) 2(H 2O) 2](ClO 4) 2 (5) and [Fe(II)(L3) 2(H 2O) 2](ClO 4) 2 (6), containing high-spin metal centres for the Co(II) and Fe(II) compounds. X-ray crystal structures were obtained for complexes 1-5. In each complex, ligands L2 and L3 coordinate to the metal centre through the pyridyl N atom and the 1-N site of the tetrazole ring, and the pyridyl-tetrazole ligand remains planar in all cases except 3. Complexes 1 and 2 comprise a central Cu 2Cl 2 dimeric core with Cu(II) in an essentially square-pyramidal coordination environment. Complexes 3 and 4 contain Co(II) in a distorted octahedral coordination environment. In 3, the pyridyl and tetrazole rings of L2 are twisted with respect to each other and the complex adopts a puckered conformation in its equatorial plane. Complex 5 contains water molecules coordinated to Fe(II) in the axial sites, which form hydrogen bonds to the perchlorate counter anions.",

keywords = "Coordination chemistry, Pyridyl-tetrazole ligand, Transition metal, X-ray crystal structures",

author = "Bond, \{Andrew D.\} and Adrienne Fleming and Jackie Gaire and Fintan Kelleher and John McGinley and Vickie McKee and Ursula Sheridan",

note = "Funding Information: J.G. thanks the Postgraduate R\&D Skills programme (Technological Sector Research, Strand I) and IT Tallaght Dublin for financial assistance. U.S. thanks NUIM for a John \& Pat Hume Fellowship. A.D.B. is grateful to the Danish Natural Sciences Research Council and the Carlsberg Foundation for provision of the X-ray equipment. ",

year = "2012",

month = feb,

day = "9",

doi = "10.1016/j.poly.2011.11.038",

language = "English",

volume = "33",

pages = "289--296",

journal = "Polyhedron",

issn = "0277-5387",

publisher = "Elsevier Ltd.",

number = "1",

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TY - JOUR

T1 - Coordination studies of copper(II), cobalt(II) and iron(II) with isomeric pyridyl-tetrazole ligands

AU - Bond, Andrew D.

AU - Fleming, Adrienne

AU - Gaire, Jackie

AU - Kelleher, Fintan

AU - McGinley, John

AU - McKee, Vickie

AU - Sheridan, Ursula

N1 - Funding Information: J.G. thanks the Postgraduate R&D Skills programme (Technological Sector Research, Strand I) and IT Tallaght Dublin for financial assistance. U.S. thanks NUIM for a John & Pat Hume Fellowship. A.D.B. is grateful to the Danish Natural Sciences Research Council and the Carlsberg Foundation for provision of the X-ray equipment.

PY - 2012/2/9

Y1 - 2012/2/9

N2 - The reaction of 2-(2H-tetrazol-5-yl)pyridine (L1) with 1,6-dibromohexane results in formation of the isomers 2-(6″-bromohexyl)-(1-tetrazol-5-yl) pyridine (L2) and 2-(6″-bromohexyl)-(2-tetrazol-5-yl)pyridine (L3). Coordination reactions of L2 and L3 with CuCl 2·2H 2O, Co(SCN) 2 and Fe(ClO 4) 2· H 2O yielded the strongly coloured solids [Cu(II)(L2)Cl 2] 2 (1), [Cu(II)(L3)Cl 2] 2 (2), [Co(II)(L2) 2(NCS) 2] (3), [Co(II)(L3) 2(NCS) 2] (4), [Fe(II)(L2) 2(H 2O) 2](ClO 4) 2 (5) and [Fe(II)(L3) 2(H 2O) 2](ClO 4) 2 (6), containing high-spin metal centres for the Co(II) and Fe(II) compounds. X-ray crystal structures were obtained for complexes 1-5. In each complex, ligands L2 and L3 coordinate to the metal centre through the pyridyl N atom and the 1-N site of the tetrazole ring, and the pyridyl-tetrazole ligand remains planar in all cases except 3. Complexes 1 and 2 comprise a central Cu 2Cl 2 dimeric core with Cu(II) in an essentially square-pyramidal coordination environment. Complexes 3 and 4 contain Co(II) in a distorted octahedral coordination environment. In 3, the pyridyl and tetrazole rings of L2 are twisted with respect to each other and the complex adopts a puckered conformation in its equatorial plane. Complex 5 contains water molecules coordinated to Fe(II) in the axial sites, which form hydrogen bonds to the perchlorate counter anions.

AB - The reaction of 2-(2H-tetrazol-5-yl)pyridine (L1) with 1,6-dibromohexane results in formation of the isomers 2-(6″-bromohexyl)-(1-tetrazol-5-yl) pyridine (L2) and 2-(6″-bromohexyl)-(2-tetrazol-5-yl)pyridine (L3). Coordination reactions of L2 and L3 with CuCl 2·2H 2O, Co(SCN) 2 and Fe(ClO 4) 2· H 2O yielded the strongly coloured solids [Cu(II)(L2)Cl 2] 2 (1), [Cu(II)(L3)Cl 2] 2 (2), [Co(II)(L2) 2(NCS) 2] (3), [Co(II)(L3) 2(NCS) 2] (4), [Fe(II)(L2) 2(H 2O) 2](ClO 4) 2 (5) and [Fe(II)(L3) 2(H 2O) 2](ClO 4) 2 (6), containing high-spin metal centres for the Co(II) and Fe(II) compounds. X-ray crystal structures were obtained for complexes 1-5. In each complex, ligands L2 and L3 coordinate to the metal centre through the pyridyl N atom and the 1-N site of the tetrazole ring, and the pyridyl-tetrazole ligand remains planar in all cases except 3. Complexes 1 and 2 comprise a central Cu 2Cl 2 dimeric core with Cu(II) in an essentially square-pyramidal coordination environment. Complexes 3 and 4 contain Co(II) in a distorted octahedral coordination environment. In 3, the pyridyl and tetrazole rings of L2 are twisted with respect to each other and the complex adopts a puckered conformation in its equatorial plane. Complex 5 contains water molecules coordinated to Fe(II) in the axial sites, which form hydrogen bonds to the perchlorate counter anions.

KW - Coordination chemistry

KW - Pyridyl-tetrazole ligand

KW - Transition metal

KW - X-ray crystal structures

UR - https://www.scopus.com/pages/publications/84855849419

U2 - 10.1016/j.poly.2011.11.038

DO - 10.1016/j.poly.2011.11.038

M3 - Article

AN - SCOPUS:84855849419

SN - 0277-5387

VL - 33

SP - 289

EP - 296

JO - Polyhedron

JF - Polyhedron

IS - 1

ER -

Coordination studies of copper(II), cobalt(II) and iron(II) with isomeric pyridyl-tetrazole ligands

Abstract

Keywords

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