6.5 RgMe vdW Complexes
As it mentioned in Sect. 6.3.1, the RgMe, Me = Ni, Zn, Cd, Hg, and Al, vdW
complexes have weakly bound electronically-excited states. Let us analyze the data
concerning these complexes briefly.
The NiAr Complexes. Transitions in the NiAr complex were observed at
wavelengths near the Ni(y
1 D 2 ← a
1 D 2 ) transition, ~ m 2 % 34000 cm
À1 . The v
0
v
00 ,
(0–5) ← 0 bands were assigned in the excitation spectrum, and the binding energy
of the upper state was determined, D
0
0 ¼ 51:7 cm
À1 . The upper and lower states
were not assigned [44].
The ZnRg Complexes. Some spectroscopic parameters, x e , x e x e , D e , and R e , of
the ZnRg(X0(
1 R
+
) and D1(
1 P)), Rg = He, Ne, Ar, vdW complexes have been
given and discussed in the monograph [40].
The HgRg Complexes. Some spectroscopic parameters, x e , x e x e , D e , B e , and R e ,
of the HgRg(X0(
1 R
+
, A0
+
(
3 P), B1(
3 R
+ +
3 P)), and C1(
1 P), Rg = He, Ne, Ar,
vdW complexes have been given and discussed in the monograph [40].
The CdRg Complexes. Rotational analysis of the CdHe(A0
+ (5
3 P 1 ) ← X0
+
(5
1 S 0 ) and B1 (5
3 P 1 ) ← X) transitions luminescence excitation spectra were carried
out in [138, 139]. Some spectroscopic parameters of these states, x e , x e x e , D e , B e ,
and R e , were determined. Data on spectroscopic parameters of CdRg (X0(
1 R
+
,
A0
+
(
3 P)), B1(
3 R
+ +
3 P)), and D1(
1 P)), Rg = He, Ne, Ar, vdW complexes are
given in the monograph [40].
The AlAr Complexes. Rotationally resolved spectra were recorded for six bands
of the AlAr(B
2 R
+
← X
2 P I/2 ) transition. The x e , x e x e , x e y e , x e z e , B e , a e , c e , D e , D 0 ,
and R e spectroscopic parameters were determined for both states [41].
References
1. Person, W.B.: Theoretical aspects of the study of molecular complexes. In: Spectroscopy
and Studies of Molecular Complexes ed. J. Yarwood, 1–104, Springer (1973)
2. Mulliken, R.S., Person, W.B.: Molecular Complexes. John Wiley and Sons, New York
(1969)
3. Blaney, B.L., Ewing, G.E.: Van der Waals molecules. Ann. Rev. Phys. Chem. 27, 553–586
(1976). https://doi.org/10.1146/annurev.pc.27.100176.003005
4. IUPAC Compendium of Chemical Terminology, 2
nd ed. (the Gold book). Complied by A.D.
McNaught and A. Wilkinson, Blackwell Scientific Publications, Oxford (1997). http://
goldbook.iupac.org
5. Arunan, E, Desiraju, G.R., Klein, R.A., J Sadlej, J., Scheiner, S, Alkorta, I., Clary, D.C.,
Crabtree, R.H., Dannenberg, J.J., Hobza, P., Kjaergaard, H.G., Legon, A.C, Mennucci, B.,
Nesbitt, D.J.: Definition of the hydrogen bond (IUPAC Recommendations 2011). Pure Appl.
Chem. 83, 1637–1641 (2011). https://doi.org/10.1351/pac-rec-10-01-02
6. Desiraju, G.R., Ho, P.S., Kloo, L., Legon, A.C., Marquardt, R., Metrangolo, P., Politzer, P.,
Resnati, G., Rissanen, K.: Definition of the halogen bond (IUPAC Recommendations 2013).
Pure Appl. Chem. 85, 1711–1713 (2013). https://doi.org/10.1351/PAC-REC-12-05-10
256
6 Weakly-Bound Complexes and Clusters
As it mentioned in Sect. 6.3.1, the RgMe, Me = Ni, Zn, Cd, Hg, and Al, vdW
complexes have weakly bound electronically-excited states. Let us analyze the data
concerning these complexes briefly.
The NiAr Complexes. Transitions in the NiAr complex were observed at
wavelengths near the Ni(y
1 D 2 ← a
1 D 2 ) transition, ~ m 2 % 34000 cm
À1 . The v
0
v
00 ,
(0–5) ← 0 bands were assigned in the excitation spectrum, and the binding energy
of the upper state was determined, D
0
0 ¼ 51:7 cm
À1 . The upper and lower states
were not assigned [44].
The ZnRg Complexes. Some spectroscopic parameters, x e , x e x e , D e , and R e , of
the ZnRg(X0(
1 R
+
) and D1(
1 P)), Rg = He, Ne, Ar, vdW complexes have been
given and discussed in the monograph [40].
The HgRg Complexes. Some spectroscopic parameters, x e , x e x e , D e , B e , and R e ,
of the HgRg(X0(
1 R
+
, A0
+
(
3 P), B1(
3 R
+ +
3 P)), and C1(
1 P), Rg = He, Ne, Ar,
vdW complexes have been given and discussed in the monograph [40].
The CdRg Complexes. Rotational analysis of the CdHe(A0
+ (5
3 P 1 ) ← X0
+
(5
1 S 0 ) and B1 (5
3 P 1 ) ← X) transitions luminescence excitation spectra were carried
out in [138, 139]. Some spectroscopic parameters of these states, x e , x e x e , D e , B e ,
and R e , were determined. Data on spectroscopic parameters of CdRg (X0(
1 R
+
,
A0
+
(
3 P)), B1(
3 R
+ +
3 P)), and D1(
1 P)), Rg = He, Ne, Ar, vdW complexes are
given in the monograph [40].
The AlAr Complexes. Rotationally resolved spectra were recorded for six bands
of the AlAr(B
2 R
+
← X
2 P I/2 ) transition. The x e , x e x e , x e y e , x e z e , B e , a e , c e , D e , D 0 ,
and R e spectroscopic parameters were determined for both states [41].
References
1. Person, W.B.: Theoretical aspects of the study of molecular complexes. In: Spectroscopy
and Studies of Molecular Complexes ed. J. Yarwood, 1–104, Springer (1973)
2. Mulliken, R.S., Person, W.B.: Molecular Complexes. John Wiley and Sons, New York
(1969)
3. Blaney, B.L., Ewing, G.E.: Van der Waals molecules. Ann. Rev. Phys. Chem. 27, 553–586
(1976). https://doi.org/10.1146/annurev.pc.27.100176.003005
4. IUPAC Compendium of Chemical Terminology, 2
nd ed. (the Gold book). Complied by A.D.
McNaught and A. Wilkinson, Blackwell Scientific Publications, Oxford (1997). http://
goldbook.iupac.org
5. Arunan, E, Desiraju, G.R., Klein, R.A., J Sadlej, J., Scheiner, S, Alkorta, I., Clary, D.C.,
Crabtree, R.H., Dannenberg, J.J., Hobza, P., Kjaergaard, H.G., Legon, A.C, Mennucci, B.,
Nesbitt, D.J.: Definition of the hydrogen bond (IUPAC Recommendations 2011). Pure Appl.
Chem. 83, 1637–1641 (2011). https://doi.org/10.1351/pac-rec-10-01-02
6. Desiraju, G.R., Ho, P.S., Kloo, L., Legon, A.C., Marquardt, R., Metrangolo, P., Politzer, P.,
Resnati, G., Rissanen, K.: Definition of the halogen bond (IUPAC Recommendations 2013).
Pure Appl. Chem. 85, 1711–1713 (2013). https://doi.org/10.1351/PAC-REC-12-05-10
256
6 Weakly-Bound Complexes and Clusters