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Mixed‐Ligand Copper(II) Complexes with the Rigid Bidentate Bis( N ‐arylimino)acenaphthene Ligand: Synthesis, Spectroscopic‐, and X‐ray Structural Characterization
Author(s) -
Paulovicova Adriana,
ElAyaan Usama,
Shibayama Koichi,
Morita Takeharu,
Fukuda Yutaka
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200109)2001:10<2641::aid-ejic2641>3.0.co;2-c
Subject(s) - chemistry , acenaphthene , ligand (biochemistry) , copper , imine , bite angle , crystallography , denticity , square pyramidal molecular geometry , metal , stereochemistry , medicinal chemistry , crystal structure , naphthalene , organic chemistry , catalysis , biochemistry , receptor
Reported are the synthesis, characterization, and crystal structures of two mixed‐ligand copper(II) complexes containing bis[ N ‐(2,6‐diisopropylphenyl)imino]acenaphthene ( o,o′ ‐ i Pr 2 C 6 H 3 ‐BIAN). In both complexes, namely [Cu(AcOH)( o,o′ ‐ i Pr 2 C 6 H 3 ‐BIAN)Cl 2 ] ( 1 ) and [Cu(acac)(AcOH)( o,o′ ‐ i Pr 2 C 6 H 3 ‐BIAN)](ClO 4 ) ( 2 ) (acac = acetylacetonate and AcOH = acetic acid), the copper ions are in a distorted square‐pyramidal coordination environment with an acetic acid molecule in each apical position. The two imine nitrogen atoms of o,o′ ‐ i Pr 2 C 6 H 3 ‐BIAN occupy the basal plane with the two chloride atoms and the two oxygen atoms of acac in complexes 1 and 2 , respectively. Complex formation results in certain structural changes inside the rigid N−N ligand. Such changes led to an increased planarity of the o,o′ ‐ i Pr 2 C 6 H 3 ‐BIAN backbone, and produced a nearly perpendicular angle between the naphthalene and the aromatic imine planes. In complex 2 , the more perpendicular arrangement of the o,o′ ‐diisopropylphenyl groups shielding the copper centre was structurally allowed by the elongation of one of the metal‐to‐ligand bonds and by the relatively larger N−Cu−N bite angle. Also discussed are IR, magnetic, and UV/Vis measurements.