TY - JOUR
T1 - New nine and ten coordinated complexes of lanthanides with bidentate 2-pyrazinecarboxylate containing hydrazinium cation
AU - Premkumar, Thathan
AU - Govindarajan, Subbaiah
AU - Rath, Nigam P.
AU - Manivannan, Vadivelu
PY - 2009/6/1
Y1 - 2009/6/1
N2 - The new hydrazinium lanthanide metal complexes of 2-pyrazinecarboxylic acid of the formulae (N2H5)2[Ln(pyzCOO)5] · 2H2O (1), where Ln = La or Ce and (N2H5)3[Ln(pyzCOO)4(H2O)] · 2NO3 (2), where Ln = Pr, Nd, Sm or Dy have been synthesized by the addition of an aqueous solution of corresponding metal nitrate hydrates to an aqueous mixture of carboxylic acid and hydrazine hydrate in an appropriate ratios. The structure of (N2H5)2[La(pyzCOO)5] · 2H2O (1a) and (N2H5)3[Nd(pyzCOO)4(H2O)] · 2NO3 (2a) have been determined from single crystal X-ray analysis. Coordination numbers from six to twelve have been established in lanthanide compounds but ten coordination appears rarely. This work reports the first ten coordinated hydrazinium lanthanide complexes with carboxylate anions. The structure contains lanthanum ions joined by 2-pyrazinecarboxylate groups forming two-dimensional sheets parallel to (0 0 1) plane. 2a is monomeric in nature and the structure comprises of N2H5+ cations, [Nd(pyzCOO)4(H2O)]- and NO3- anions. The neodymium is nine coordinated with four pyzCOO lignads, bidentate (N,O) to the metal and the lone water molecule completes the coordination sphere and the sheets like pattern in all are interlinked via multiple hydrogen bonds leading to three dimensional structure.
AB - The new hydrazinium lanthanide metal complexes of 2-pyrazinecarboxylic acid of the formulae (N2H5)2[Ln(pyzCOO)5] · 2H2O (1), where Ln = La or Ce and (N2H5)3[Ln(pyzCOO)4(H2O)] · 2NO3 (2), where Ln = Pr, Nd, Sm or Dy have been synthesized by the addition of an aqueous solution of corresponding metal nitrate hydrates to an aqueous mixture of carboxylic acid and hydrazine hydrate in an appropriate ratios. The structure of (N2H5)2[La(pyzCOO)5] · 2H2O (1a) and (N2H5)3[Nd(pyzCOO)4(H2O)] · 2NO3 (2a) have been determined from single crystal X-ray analysis. Coordination numbers from six to twelve have been established in lanthanide compounds but ten coordination appears rarely. This work reports the first ten coordinated hydrazinium lanthanide complexes with carboxylate anions. The structure contains lanthanum ions joined by 2-pyrazinecarboxylate groups forming two-dimensional sheets parallel to (0 0 1) plane. 2a is monomeric in nature and the structure comprises of N2H5+ cations, [Nd(pyzCOO)4(H2O)]- and NO3- anions. The neodymium is nine coordinated with four pyzCOO lignads, bidentate (N,O) to the metal and the lone water molecule completes the coordination sphere and the sheets like pattern in all are interlinked via multiple hydrogen bonds leading to three dimensional structure.
KW - Coordination compounds
KW - Hydrazine
KW - Lanthanides
KW - Thermal analysis
KW - X-ray diffraction
UR - https://www.scopus.com/pages/publications/64949154020
U2 - 10.1016/j.ica.2008.12.014
DO - 10.1016/j.ica.2008.12.014
M3 - Article
AN - SCOPUS:64949154020
SN - 0020-1693
VL - 362
SP - 2941
EP - 2946
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 8
ER -