TY - JOUR
T1 - Influence of the non-coordinating alkyl chain type in N-alkylated iminodiacetamides on the stability and structure of their complexes with nickel(II) and cobalt(II)
AU - Smrečki, Neven
AU - Jović, Ozren
AU - Molčanov, Krešimir
AU - Kukovec, Boris Marko
AU - Kekez, Ivana
AU - Matković-Čalogović, Dubravka
AU - Popović, Zora
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017
Y1 - 2017
N2 - Reactions of N-alkyliminodiacetamides (Meimda, Etimda, n-Primda, i-Primda, n-Buimda, i-Buimda and t-Buimda; Me = methyl, Et = ethyl, n-Pr = n-propyl, i-Pr = isopropyl, n-Bu = n-butyl, i-Bu = isobutyl and t-Bu = tert-butyl) with nickel(II) and cobalt(II) nitrate in aqueous solutions resulted in complexes of the general formula [M(Rimda)2](NO3)2. Fourteen new complexes [Ni(Meimda)2](NO3)2 (1a), [Co(Meimda)2](NO3)2 (1b), [Ni(Etimda)2](NO3)2 (2a), [Co(Etimda)2](NO3)2 (2b), [Ni(n-Primda)2](NO3)2 (3a), [Co(n-Primda)2](NO3)2 (3b), [Ni(i-Primda)2](NO3)2 (4a), [Co(i-Primda)2](NO3)2 (4b), [Ni(n-Buimda)2](NO3)2 (5a), [Co(n-Buimda)2](NO3)2 (5b), [Ni(i-Buimda)2](NO3)2 (6a), [Co(i-Buimda)2](NO3)2 (6b), [Ni(t-Buimda)2](NO3)2 (7a) and [Co(t-Buimda)2](NO3)2 (7b) were prepared and characterized by infrared spectroscopy and thermal analysis (TG/DTA). Several were also characterized by single-crystal X-ray diffraction (1a, 1b, 3a, 3b, 5a, 5b, 6a and 7a). The octahedral coordination environment around the nickel(II) and cobalt(II) ions in the structures of the complexes consists of two O,N,O′-tridentate N-arylalkyliminodiacetamide ligands arranged in a fac-position, resulting in the formation of trans isomers in all cases. Hydrogen bonds link cations and anions in 3D networks with alternating layers of cations and anions. The molecular geometry and infrared spectra of these complexes were also studied by DFT calculations using the B3LYP/6-311G(d,p) computational model. The calculated spectra and molecular geometry agree well with the experimental results despite the extensive hydrogen bonding networks. The stability of the complex cation [M(Rimda)2]2+ (expressed in term of binding energy between the cation M2+ and two Rimda molecules in the gas phase) increases for both Ni(II) and Co(II) with rising length of the alkyl chain in the case of the ligands containing non-branched side-chains.
AB - Reactions of N-alkyliminodiacetamides (Meimda, Etimda, n-Primda, i-Primda, n-Buimda, i-Buimda and t-Buimda; Me = methyl, Et = ethyl, n-Pr = n-propyl, i-Pr = isopropyl, n-Bu = n-butyl, i-Bu = isobutyl and t-Bu = tert-butyl) with nickel(II) and cobalt(II) nitrate in aqueous solutions resulted in complexes of the general formula [M(Rimda)2](NO3)2. Fourteen new complexes [Ni(Meimda)2](NO3)2 (1a), [Co(Meimda)2](NO3)2 (1b), [Ni(Etimda)2](NO3)2 (2a), [Co(Etimda)2](NO3)2 (2b), [Ni(n-Primda)2](NO3)2 (3a), [Co(n-Primda)2](NO3)2 (3b), [Ni(i-Primda)2](NO3)2 (4a), [Co(i-Primda)2](NO3)2 (4b), [Ni(n-Buimda)2](NO3)2 (5a), [Co(n-Buimda)2](NO3)2 (5b), [Ni(i-Buimda)2](NO3)2 (6a), [Co(i-Buimda)2](NO3)2 (6b), [Ni(t-Buimda)2](NO3)2 (7a) and [Co(t-Buimda)2](NO3)2 (7b) were prepared and characterized by infrared spectroscopy and thermal analysis (TG/DTA). Several were also characterized by single-crystal X-ray diffraction (1a, 1b, 3a, 3b, 5a, 5b, 6a and 7a). The octahedral coordination environment around the nickel(II) and cobalt(II) ions in the structures of the complexes consists of two O,N,O′-tridentate N-arylalkyliminodiacetamide ligands arranged in a fac-position, resulting in the formation of trans isomers in all cases. Hydrogen bonds link cations and anions in 3D networks with alternating layers of cations and anions. The molecular geometry and infrared spectra of these complexes were also studied by DFT calculations using the B3LYP/6-311G(d,p) computational model. The calculated spectra and molecular geometry agree well with the experimental results despite the extensive hydrogen bonding networks. The stability of the complex cation [M(Rimda)2]2+ (expressed in term of binding energy between the cation M2+ and two Rimda molecules in the gas phase) increases for both Ni(II) and Co(II) with rising length of the alkyl chain in the case of the ligands containing non-branched side-chains.
KW - Alkyl chain type
KW - DFT geometry and vibrational calculation
KW - Iminodiacetamide
KW - Nickel(II) and cobalt(II)
KW - X-ray crystal structure
UR - http://www.scopus.com/inward/record.url?scp=85018254503&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2017.03.060
DO - 10.1016/j.poly.2017.03.060
M3 - Article
AN - SCOPUS:85018254503
SN - 0277-5387
VL - 130
SP - 115
EP - 126
JO - Polyhedron
JF - Polyhedron
ER -