A detailed study of the structure and bonding pattern of the trigonal alkaline earth,
metal clusters at the B3LYP/6-311+G(d) level is carried out. The stability aspects of these clusters are correlated with their aromaticity criterion calculated in terms of NICS measures. Further stabilization of such anionic metal clusters upon complexation with suitable counter cations is predicted. The existence of the phenomenon of "bond stretch isomerism" among such anionic metal systems is also explored.