The new tetradentate symmetrical (2R,2′S)-1,1′-piperazine-1,4-diyldipropane-2-thiol) (L1), (2S)-1-[bis(2-aminoethyl)amino]propan-2-ol) (L2), and 2-{(E)-[((1R,2S)-2-{[(1Z)-(2-hydroxy phenyl)methylene]amino}cyclohexyl)imino]methyl}phenol (L3) ligands were synthesized and characterized on the basis of FT-IR, 1H, 13C NMR, EI mass, and elemental analysis. Three commercially available ligands, (2,2′-[ethane-1,2-diylbis(thio)]diethanol (L4), 2,2′-dithiodiethanenamine (L5), and (2,2′-[ethane-1,2-diyldi(imino)] diethanol (L6), were also studied. Pt(II) complexes were characterized by FTIR, elemental analysis and thermal methods. Thermal behaviors of these complexes were investigated in the range 10–1000 °C. Magnetic properties were also studied, and the all complexes were found to be diamagnetic. The structures consist of the monomeric units in which the Pt(II) atoms exhibit square planar geometry. N,N′-bis(salicylidene)-1,2-cyclohexane has been synthesized and characterized by X-ray single crystal diffraction measurement. The ligand crystallizes in monoclinic crystal system and space group, Cc.
1. Chantarasiri, N, Tuntulani, T, Tongraung, R, Seangprasertkit-Magee, R, Wannarong, W. New metal-containing epoxy polymers from diglycidyl ether of bisphenol A and tetradentate Schiff base metal complexes. Eur Polym J. 2000;36:695–702. .
2. Pignatello, R, Panico, A, Mazzone, P, Pinizzotto, MR. Garozzo APM: Fumeri Schiff bases of N-hydroxy-N′-aminoguanidines as antiviral, antibacterial and anticancer agents. Eur J Med Chem. 1994;29:781–785. .
3. Guofa, L, Tongshun, S, Yongnian, Z. Infrared and Raman spectra of complexes about rare earth nitrate with Schiff base from o-vanillin and 1-naphthylamine. J Mol Struct. 1997;412:75–81. .
4. Albertin, G, Bordignon, E, Orio, AA. Five-coordinate copper(II) complexes. Synthesis and properties of [Cu(tren)L]2+ cations. Inorg Chem. 1975;14:1411–1413. .
5. Raman, N, Kulondaisamy, A, Thangarja, C, Jeyasubramanian. Redox and antimicrobial studies of transition metal(II) tetradentate ligands. Trans Met Chem. 2003;28:29–36. .
6. Raman, N, Kulandaisamy, A, Jeyasubramanian, K. Synthesis, spectroscopic characterization, redox, and biological screening studies of some Schiff base transition metal(II) complexes derived from salicylidene-4-aminoantipyrine and 2-aminophenol/2-aminothio phenol. Synth React Inorg Met Org Chem. 2001;31:1249–1270. .
7. Tarafder, MTH, Ali, MA, Sarvanan, N, Weng, WY, Umar Tsafe, N, Crouse, KA. Coordination chemistry and biological activity of two tridentate ONS and NNS Schiff bases derived from S-benzyldithiocarbazate. Trans Met Chem. 2000;25:295–298. .
8. Collman, J, Hegadus, LS. Principals and application of organotransition metal chemistry. Mill Valley: University Science Books; 1980.
9. Zhao, J, Zhao, B, Liu, J, Xu, W, Wang, Z. Spectroscopy study on the photochromism of Schiff bases N,N-bis(salicylidene)-1,2-diaminoethane and N,N-bis(salicylidene)-1,6-hexanediamine. Spectrochim Acta. 2001;57A:149–154. .
10. Zgierski, MZ, Grabowska, A. Theoretical approach to photochromism of aromatic Schiff bases: a minimal chromophore salicylidene methylamine. J Chem Phys. 2000;113:7845–7853. .
11. Kaim, W, Schwederski, B. Bioinorganic chemistry: inorganic elements in the chemistry of life. New York: Wiley; 1996.
12. Szlyk, E, Barwiolek, M, Kruszynki, R, Bartczak, T. Synthesis and spectroscopic studies of the optically active copper(II), cobalt(II) and nickel(II) complexes with Schiff bases N,N′-(1R, 2R)(−)-1,2-cyclohexylenebis(3-methoxybenzylideneiminato), N,N′-(1R, 2R)(−)-1,2-cyclohexylenebis(5-methoxybenzylideneiminato) and X-ray diffraction structure of the [Cu(II)(1R, 2R)(−)chxnbis(5-methylbenzylideneiminato)2]. Inorg Chim Acta. 2005;358:3642–3652. .
13. Altomare, A, Cascarano, G, Giacovazzo, C, Guagliardi, A, Burla, M, Polidori, G, Camalli, MA. Program for automatic solution of crystal structures by direct methods. J Appl Cryst. 1994;27:435 .
14. Beurskens, PT, Admiraal, G, Beurskens, G, Bosman, WP, de Gelder, R, Israel, R, Smits, JMM. The DIRDIF-99 program system, technical report of the crystallography laboratory. The Netherlands: University of Nijmegen; 1999.
15. Crystal Structure3.6.0: Crystal Structure Analysis Package, Rigaku and Rigaku/MSC (2000-2004). 9009 New Trails Dr. The Woodlands TX 77381 USA.
16. Watkin, DJ, Prout, CK, Carruthers, JR, Betteridge, PW. CRYSTALS Issue 10. Chemical crystallography laboratory. Oxford: University of Oxford; 1996.
17. Felicio, RC, Cavalherio, ET, Dockal, ER. Preparation, characterization and thermo gravimetric studies of [N,N-cis-1,2-cyclohexylene bis(salicylideneaminato)] cobalt(II) and [N,N-(9)-trans-1,2-cyclohexylene bis(salicylideneaminato)] cobalt(II). Polyhedron. 2001;20:261–268. .