Synthesis of complexes of 2,2 ': 6 ',2 ''-terpyridine and 1,10-phenanthroline with lanthanide thiocyanates; the molecular structures of [Ln(terpy)(2)(NCS)(3)] (Ln = Pr, Nd), [Nd(terpy)(2)(NCS)(3)]center dot 2EtOH and [Ln(phen)(3)(NCS)(3)]center dot EtOH (Ln = Pr, Nd)

S A Cotton, V Franckevicius, R E How, B Ahrens, L L Ooi, M F Mahon, P R Raithby, S J Teat

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Abstract

The complexes [Ln(terpy)(2)(NCS)(3)] (Ln = Pr (1), Nd (2); terpy = 2,2':6',2"-terpyridine), [Nd(terpY)2(NCS)(3)]-2EtOH (3) and [Ln(phen)3(NCS)3].EtOH (Ln = Pr(4), Nd (5); phen = 1,10-phenanthroline) have been synthesised in high yield by the reaction of [Ln(NO3)(3)].6H(2)O (Ln = Pr, Nd) with KNCS and subsequently with terpy or phen, respectively. The five complexes have been characterised crystallographically, and it is found that the pairs of complexes, I and 2, and 4 and 5 are isomorphous with each other. In all the complexes the lanthanoid ions are nine co-ordinate, and all contain meridionally disposed thiocyanate groups. The molecular geometry of 3 is very similar to that of 2, and the crystal structure differs only in the presence of the two ethanol solvent molecules. In the whole series of complexes the Ln-N(thiocyanate) distances are shorter than the Ln-N(terpy/phen) distances and there is a shortening of all the lanthanoid-ligand bonds in the neodymium complexes compared with the praseodymium, consistent with the expected 'lanthanide contraction' that occurs as additional electrons enter the 4f orbitals. In all the complexes the thiocyanate groups are linear, but there is a significant variation in the angle at the thiocyanate at nitrogen and Ln-N-C angles lie in the range 147-177degrees. (C) 2003 Elsevier Science Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1489-1497
Number of pages9
JournalPolyhedron
Volume22
Issue number11
DOIs
Publication statusPublished - 2003

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Thiocyanates
Praseodymium
Lanthanoid Series Elements
Neodymium
Rare earth elements
Molecular structure
Ethanol
molecular structure
Crystal structure
Ligands
Nitrogen
Molecules
praseodymium
Geometry
Electrons
Ions
neodymium
synthesis
contraction
ethyl alcohol

Cite this

@article{900dee17fae64fef92e71004b0c3bddf,
title = "Synthesis of complexes of 2,2 ': 6 ',2 ''-terpyridine and 1,10-phenanthroline with lanthanide thiocyanates; the molecular structures of [Ln(terpy)(2)(NCS)(3)] (Ln = Pr, Nd), [Nd(terpy)(2)(NCS)(3)]center dot 2EtOH and [Ln(phen)(3)(NCS)(3)]center dot EtOH (Ln = Pr, Nd)",
abstract = "The complexes [Ln(terpy)(2)(NCS)(3)] (Ln = Pr (1), Nd (2); terpy = 2,2':6',2{"}-terpyridine), [Nd(terpY)2(NCS)(3)]-2EtOH (3) and [Ln(phen)3(NCS)3].EtOH (Ln = Pr(4), Nd (5); phen = 1,10-phenanthroline) have been synthesised in high yield by the reaction of [Ln(NO3)(3)].6H(2)O (Ln = Pr, Nd) with KNCS and subsequently with terpy or phen, respectively. The five complexes have been characterised crystallographically, and it is found that the pairs of complexes, I and 2, and 4 and 5 are isomorphous with each other. In all the complexes the lanthanoid ions are nine co-ordinate, and all contain meridionally disposed thiocyanate groups. The molecular geometry of 3 is very similar to that of 2, and the crystal structure differs only in the presence of the two ethanol solvent molecules. In the whole series of complexes the Ln-N(thiocyanate) distances are shorter than the Ln-N(terpy/phen) distances and there is a shortening of all the lanthanoid-ligand bonds in the neodymium complexes compared with the praseodymium, consistent with the expected 'lanthanide contraction' that occurs as additional electrons enter the 4f orbitals. In all the complexes the thiocyanate groups are linear, but there is a significant variation in the angle at the thiocyanate at nitrogen and Ln-N-C angles lie in the range 147-177degrees. (C) 2003 Elsevier Science Ltd. All rights reserved.",
author = "Cotton, {S A} and V Franckevicius and How, {R E} and B Ahrens and Ooi, {L L} and Mahon, {M F} and Raithby, {P R} and Teat, {S J}",
note = "ID number: ISI:000183212900011",
year = "2003",
doi = "10.1016/s0277-5387(03)00133-5",
language = "English",
volume = "22",
pages = "1489--1497",
journal = "Polyhedron",
issn = "0277-5387",
publisher = "Elsevier",
number = "11",

}

TY - JOUR

T1 - Synthesis of complexes of 2,2 ': 6 ',2 ''-terpyridine and 1,10-phenanthroline with lanthanide thiocyanates; the molecular structures of [Ln(terpy)(2)(NCS)(3)] (Ln = Pr, Nd), [Nd(terpy)(2)(NCS)(3)]center dot 2EtOH and [Ln(phen)(3)(NCS)(3)]center dot EtOH (Ln = Pr, Nd)

AU - Cotton, S A

AU - Franckevicius, V

AU - How, R E

AU - Ahrens, B

AU - Ooi, L L

AU - Mahon, M F

AU - Raithby, P R

AU - Teat, S J

N1 - ID number: ISI:000183212900011

PY - 2003

Y1 - 2003

N2 - The complexes [Ln(terpy)(2)(NCS)(3)] (Ln = Pr (1), Nd (2); terpy = 2,2':6',2"-terpyridine), [Nd(terpY)2(NCS)(3)]-2EtOH (3) and [Ln(phen)3(NCS)3].EtOH (Ln = Pr(4), Nd (5); phen = 1,10-phenanthroline) have been synthesised in high yield by the reaction of [Ln(NO3)(3)].6H(2)O (Ln = Pr, Nd) with KNCS and subsequently with terpy or phen, respectively. The five complexes have been characterised crystallographically, and it is found that the pairs of complexes, I and 2, and 4 and 5 are isomorphous with each other. In all the complexes the lanthanoid ions are nine co-ordinate, and all contain meridionally disposed thiocyanate groups. The molecular geometry of 3 is very similar to that of 2, and the crystal structure differs only in the presence of the two ethanol solvent molecules. In the whole series of complexes the Ln-N(thiocyanate) distances are shorter than the Ln-N(terpy/phen) distances and there is a shortening of all the lanthanoid-ligand bonds in the neodymium complexes compared with the praseodymium, consistent with the expected 'lanthanide contraction' that occurs as additional electrons enter the 4f orbitals. In all the complexes the thiocyanate groups are linear, but there is a significant variation in the angle at the thiocyanate at nitrogen and Ln-N-C angles lie in the range 147-177degrees. (C) 2003 Elsevier Science Ltd. All rights reserved.

AB - The complexes [Ln(terpy)(2)(NCS)(3)] (Ln = Pr (1), Nd (2); terpy = 2,2':6',2"-terpyridine), [Nd(terpY)2(NCS)(3)]-2EtOH (3) and [Ln(phen)3(NCS)3].EtOH (Ln = Pr(4), Nd (5); phen = 1,10-phenanthroline) have been synthesised in high yield by the reaction of [Ln(NO3)(3)].6H(2)O (Ln = Pr, Nd) with KNCS and subsequently with terpy or phen, respectively. The five complexes have been characterised crystallographically, and it is found that the pairs of complexes, I and 2, and 4 and 5 are isomorphous with each other. In all the complexes the lanthanoid ions are nine co-ordinate, and all contain meridionally disposed thiocyanate groups. The molecular geometry of 3 is very similar to that of 2, and the crystal structure differs only in the presence of the two ethanol solvent molecules. In the whole series of complexes the Ln-N(thiocyanate) distances are shorter than the Ln-N(terpy/phen) distances and there is a shortening of all the lanthanoid-ligand bonds in the neodymium complexes compared with the praseodymium, consistent with the expected 'lanthanide contraction' that occurs as additional electrons enter the 4f orbitals. In all the complexes the thiocyanate groups are linear, but there is a significant variation in the angle at the thiocyanate at nitrogen and Ln-N-C angles lie in the range 147-177degrees. (C) 2003 Elsevier Science Ltd. All rights reserved.

U2 - 10.1016/s0277-5387(03)00133-5

DO - 10.1016/s0277-5387(03)00133-5

M3 - Article

VL - 22

SP - 1489

EP - 1497

JO - Polyhedron

JF - Polyhedron

SN - 0277-5387

IS - 11

ER -