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Several copper(II) coordination compounds with the tridentate κ 3 - N,N,O bisligand (L = bis(3,5-dimethylpyrazol-1-yl)acetate or its molecular acid form HL = Hbdmpza) were synthesized from different starting metal salts in appropriate acidic water solutions as reported. The XRD single crystal structural analysis reveals neutral acidic ligand form in [Cu(HL) 2 ]·2(HSO 4 ) ( 1 ) and [Cu(HL) 2 ]·2Cl ( 2 ), while ionic in [Cu(L) 2 ]·(CH 3 COOH)·(H 2 O) ( 3 ), and [Cu(L) 2 ]·2(H 2 O) ( 4 ). The molecular structures of 2 and 3 are first reported herein, thus enabling a clearer insight for the IR - structural analysis. Two carboxylate C-O bond lengths ranges, namely differing 1.29/1.22 Ǻ for 2 , and the same 1.24/1.24 Ǻ for 3 , respectively, are in agreement with the single(longer)/double(shorter) character of both bonds for the neutral carboxylic  HL in 2 , and the same character of both bonds for the carboxylate anionic L - in 3 , as seen for the related 1 (HL) and 4 (L - ). The most distinguished IR spectra difference for the molecular (HL) / ionic (L - ) is at the 1700 cm -1 carboxylate band. The C=O free ligand (HL) double bond position at 1740 cm -1 is most similar with 1702 cm -1 in 1 , while a split band at 1697, 1665 cm -1 is seen for 2 . On the other hand, the anionic asymmetric carboxylate stretching IR band ( ` n as (COO − )) for 3 (1642 cm -1 ) and 4 (1635 cm -1 ) is found at lower energy region. Thus, the additional band within the same region, as seen only for 3 at 1716 cm -1 , is assigned to the network neutral acetic acid C=O double bond.

IR analysis of the carboxylate forms in structurally determined [CuII(κ3-L)2] species isolated from different acidic solutions