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Synthesis and Structure of the Copper(II) Nitrate Complex with 1-(3-Methyl-1-phenylpyrazol-5-onylidene-4)-3,3-dimethyl-1,2,3,4-tetrahydroisoquinoline

“…1) differs substantially from those of the earlier studied copper(II) chloride and nitrate complexes with ligands L and L 1 , [Cu Cl 2 ] · (II) [2] and [Cu(H 2 O) 2 (NO 3 ) 2 ] · L 2 (III) [3]. Unlike monomeric complex II (Fig.…”

“…106.8(5) N(1)C(9)C(10) 108.6(5) N(1)C(9)C (11) 106.8 (5) 23) 177(1) The IR spectrum of compound L exhibits (in the region of stretching vibrations of the C=O, C=N, and C=C groups (1750-1550 cm -1 )) intense bands at 1621 sh, 1604 vs, 1594 vs, and 1561 s cm -1 [1], which are mainly similar to the bands in the spectrum of tetrahydroisoquinoline L 1 : 1618 vs, 1592 vs, and 1555 vs cm -1 [2]. In the spectrum of complex I, these bands are shifted, and their relative intensity is redistributed.…”

“…In the structure of dinitrate complex III (Fig. 3) with the Cu to L ratio different from that in I where L 2 is 1-morpholino-3,3-dimethyl-3,4-dihydroisoquinoline [11]. The geometric characteristics used for the estimation of the structural function of the nitrate groups [12] are presented in Table 3.…”

“…Table 3. Geometric methods used for the estimation of the coordination mode of the nitrate groups in complexes I, III, and IV [11] Type of bond Compound As was already mentioned above, the π-electron density is distributed over the above-indicated bonds in all molecules L and L 1 of compounds I-III in such a way that each molecule contains some contribution of the limiting bipolar form (a*) to the enaminoketone isomeric form (a). The degree of the π-electron density delocalization and, correspondingly, the value of a* contribution depend on the structural function of molecules L and L 1 and their conformation.…”

“…The coordinated and solvated L 1 molecules in complex II have close geometric parameters and almost the same structure as that of molecule L in a free state. Attempts to obtain complex of L with copper(II) nitrate in acetonitrile at the Cu(II) to L ratio = 1 : 2 gave the compound [ Cu ( H 2 O ) 2 ( NO 3 ) 2 ] · L 2 ( III ) [3]. In this compound, molecule L is not coordinated by the copper atom but is linked with the [Cu ( H 2 O ) 2 ( NO 3 ) 2 ] complex through hydrogen bonds.…”