1. Sergiy Krasnokutski and Dong-Sheng Yang University of Kentucky, Lexington, KY 40506, USA $ National Science Foundation $

2. 1. J. Miyawaki and K.-i. Sugawara, Chem. Phys. Lett. 386, 196 (2004). 4.43 Debye 2.37 Debye 2. X. Wang, B. R. Sohnlein, S. G. Li, J. F. Fuller, and D. S. Yang, Canadian Journal of Chemistry-Revue Canadienne De Chimie 85 (10), 714 (2007). 4. W. Y. Guo, H. C. Liu, and S. H. Yang, Int. J. Mass. Spectrom 226 (2), 291 (2003). Cu Mg

3. M. T. Rodgers, J. R. Stanley, and R. Amunugama, J. Am. Chem. Soc. 122 (44), 10969 (2000). 4.43 Debye 2.37 Debye Mg +, Al +, Sc +, Ti +, V +, Cr +, Mn +, Fe +,Co +, Ni +, Cu +, and Zn +

4. R. Amunugama and M. T. Rodgers, Int. J. Mass. Spectrom 196, 439 (2000). 4.43 Debye 2.37 Debye

6. Wavenumber (cm -1 )

8. Li-PyridineCa-Pyridine

9. 1 A'  2 A' 1 A'  2 A" 3 A"  4 A" 1A12B11A12B1  E (cm -1 ) 2266 0 2948 5105

12. Li-pyridine Li-pyridazine LUMO

14. Li-pyridineCa-pyridineSc-pyridineLi-pyridazineCa-pyridazine Type of the bond ?? dissociation energy (cm -1 ) Experiment* 4187-928813977- dissociation energy (cm -1 ) calculation 42152368867913206??? Ionization energy (cm -1 ) experiment 3246039064428163787041928 Ionization energy (cm -1 ) calculation 33506386024265438921  41779  45035 * where from collision induced dissociation experiment