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Dinuclear Nitrato Coordination Compounds with Bis(3,5‐ tert ‐butylpyrazol‐1‐yl)acetate
Author(s) -
Kozlevčar Bojan,
Jakomin Klemen,
Počkaj Marta,
Jagličić Zvonko,
Beyer Andreas,
Burzlaff Nicolai,
Kitanovski Nives
Publication year - 2015
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/ejic.201500368
Subject(s) - chemistry , coordination sphere , ligand (biochemistry) , trigonal bipyramidal molecular geometry , crystallography , carboxylate , ligand field theory , coordination complex , stereochemistry , antiferromagnetism , hydrogen bond , coordination geometry , square pyramidal molecular geometry , metal , ion , crystal structure , molecule , receptor , biochemistry , physics , organic chemistry , condensed matter physics
Two dinuclear centrosymmetric coordination compounds with the bis(3,5‐di‐ tert ‐butylpyrazol‐1‐yl)acetic acid anion (L – = bd t bpza), namely, violet [Co(bd t bpza)(NO 3 )] 2 ( 1 ) and turquoise [Cu(bd t bpza)(NO 3 )] 2 ( 2 ), are reported. Around each metal(II) ion, the L – ligand is κ 3 ‐ N , N , O coordinated, and the M–O bonds are significantly longer than both M–N bonds. The coordination sphere is completed by short nitrato and M–O bonds to a ligand that is already κ 3 ‐ N , N , O coordinated to the adjacent intra‐dinuclear metal center. Therefore, each L – ligand has a total coordination number of four but with different carboxylate modes, namely, κ 4 ‐ N , N , O , O (1,1) in 1 and κ 4 ‐ N , N , O , O′ (1,3) in 2 for the C(1)–O–C(2) group. Thus, the coordination spheres are MO 2 N 2 O in both cases, though 1 is distorted trigonal bipyramidal, whereas 2 is square pyramidal. Antiferromagnetic (AFM) coupling (17 cm –1 ) is seen only in 1 , though the best fit was obtained with consideration of spin–orbit coupling along with zero‐field splitting owing to exchange anisotropy. The new dinuclear nitrato species might be alternatives to previously reported mimics of enzyme active sites.