Nanoparticles of manganese oxides as efficient catalyst for the synthesis of pyrano[2,3-d]pyrimidine derivatives and their complexes as potent protease inhibitors

Spectral, thermal, antimicrobial studies for silver(I) complexes of pyrazolone derivatives

“…1 and Table 1) which confirms that the ligand molecule coordinated with metal ions through the hydrazon nitrogen atom [31]. A medium wide band for the H 2 O stretching vibrations of coordinated water molecules at 3379, 3364, and 3364 cm −1 [31];The stretching vibrations ν(C-H) of phenyl groups and −CH 3 units in these complexes are assigned as a number of bands in the region 3066-3100 cm −1 [11,12]. The ν(C = O) vibration appears in the region of 1666-1685 cm −1 .…”

“…Comparing the Ag(I) IR spectrum with the free ligand spectrum, the transfer of (C = N) groups to lower frequency values (1512, 1515, 1523 and 1527 cm −1 ) and the change in strength of (C = N) from medium to strong (Fig. 1 and Table 1 ) which confirms that the ligand molecule coordinated with metal ions through the hydrazon nitrogen atom [ 31 ]. A medium wide band for the H 2 O stretching vibrations of coordinated water molecules at 3379, 3364, and 3364 cm −1 [ 31 ];The stretching vibrations ν(C-H) of phenyl groups and −CH 3 units in these complexes are assigned as a number of bands in the region 3066–3100 cm −1 [ 11 , 12 ].…”

“…The complexes of three ligands with Ag(I) contain only one plane of symmetry and therefore the complexes that belong to C S symmetry and show 159 vibrational fundamentals, and all vibrations are distributed between movements of the types A \ and A 1 \\ , all of which are monodegenrate, infra—red and Raman active. The free ligand infrared spectrum shows bands at 1496, 1508 and 1550 cm −1 due to the stretching vibration of hydrazono (C = N) groups [ 31 ]. Comparing the Ag(I) IR spectrum with the free ligand spectrum, the transfer of (C = N) groups to lower frequency values (1512, 1515, 1523 and 1527 cm −1 ) and the change in strength of (C = N) from medium to strong (Fig.…”

“…The spectra of the isolated solid complexes revealed a number of new bands of different intensities for ν(M-N). The ν(Ag-N) bands observed at 813, 837 cm −1 for Ag(I)-L 1 , at 748, 794 cm −1 for Ag(I)-L 2 and at 759, 779 cm −1 for Ag(I)-L 3 (Table 1) which are absent in the spectrum of free three ligands [30][31][32]. The coordinating water in the three complexes are characterized by the appearance of ν(Ag-O) at 577, 515, 544 cm −1 .…”

Preparation, characterization, in vitro cell cytotoxicity and biological studies of Pd(II), Ag(I), Pt(IV) and Hg(II) piroxicam anti-inflammatory drug complexes

“…Egyptian Journal of Chemistry http://ejchem.journals.ekb.eg/ It resembles that the role of metal ions is imperious for the path of function of piroxicam. The preparation and characterization of novel metal piroxicam complexes are important for preferable realization of the drug-metal interactions [1][2][3][4][5][6][7][8][9].…”