Peng Zheng-he

Novel heterodinuclear transition metal macrocyclic complexes: syntheses, characterization and crystal structures

Two unsymmetrical, macrocyclic, heterodinuclear complexes, [CuIIMII(L)] (ClO4)2·nH2O (n = 3; M = Zn, Cd) have been obtained by cyclocondensation of N,N′-bis(3-formyl-5-n-butylsalicylidene)ethylenediimine and 1,3-diaminopropane in the presence of M2+. The structures of both complexes were determined by X-ray diffraction techniques. In each complex, two metals are located in the tetraimine macrocyclic cavity, and a water molecule and a perchlorate group are separately coordinated to the metal ions on the same side of the ring. Coordination geometry around each metal is approximately square pyramidal. ESMS spectra were used to characterize the complexes and isotopic distributions were investigated.

Synthesis, conductivity and photosensitivity of 2-D conjugated polymers of metalporphyrazine with sulfur bridges

The title polymers PMS8Pz, M=MnII, FeII, CoII, NiII, CuII, ZnII, were synthesized by reaction of 2, 3, 5, 6-tetracyano-1, 4-dithiin with corresponding metal salts, respectively. The structure and properties of these polymers were characterized by elemental analysis, transmission electron microscope, DTA, IR, UV-Vis, fluorescence and EPR spectra. It has been found that these conjugated polymers have the property of intrinsic semiconductor. The conductivity σ298K of these polymers is in the range of 10−9≈10−3 S·cm−1 under pressure 10.63 MPa and incrementals in the metal order Mn<Co<Fe<Zn<Cu<Ni. The photosensitivity of the MS8Pz to the CdS-PVA films is incrementals in the metal order Zn<Mn<Co<Fe<Cu<Ni.

Thermal decomposition kinetics of M (mnt) (5-NO2-phen) (M=CoII, CuII, ZnII) complexes

Abstract Studies of the non-isothermal decomposition of M (mnt) (5-NO 2 -phen) (M=Co II , Cu II , Zn II ) were carried out by thermogravimetry. The thermal decomposition mechanisms and associated kinetics have been investigated. The kinetic parameters were obtained from an analysis of the TG–DTG curves by integral and differential methods. The most probable kinetic model functions were suggested by comparison of the kinetic parameters. Mathematical expressions for the kinetic compensation effect were derived.

Infrared spectroscopic and theoretical studies on cobalt (II) complex of maleinitriledithiolate and 4, 4′-dimethyl-2, 2′-bipyridine

The complete experimental IR spectra and vibrational analysis of the title complex Co(mnt) (dmbpy) were reported in this paper. The results show that the complex molecule has a planar geometry belonging to point groupC2v and ground electronic state with spin quartet. A new method for analyzing vibrational spectra of complicated molecule is established. The essential of this method is to point out main fixed points and pivotal vibrational units in assignment for each fundamental band. Two new symbols π (heaving along the specified direction) andM (midpoint of a bond or unit) were defined for describing the vibrational modes accurately.

A novel degradation pathway of Zn (dmid) (phen)2 in pyridine

The light-oxidation degradation processes of Zn(dmid)(phen)2 (dmid=4,5-dimercapto-1, 3-dithiole-2-one, phen=1, 10-phenanthroaline) in pyridine solvent has been monitored. It has been found under the light, dmid2− of Zn(dmid)(phen)2 in pyridine solution could generate NCS− and NCS− replaces dmid2− to form Zn(NCS)2 (phen)2 simultaneously. The crystal structure of Zn(NCS)2(phen)2 has been determined. In the crystal of Zn(NCS)2(phen)2, two NCS− ligands are arranged in syn-configuration, and there is strong ππ interaction between the two adjacent parallel phen.