{Insert Figure 6}
The magnitude of the ρ (r) and ∇2ρ (r) values for the five intermolecular O–H···O interactions fall in the range (0.013 < ρ (r) e Å-3 < 0.236; 0.580 < ∇2ρ (r) e Å-5 < 3.355) proposed by Koch-Popelier for hydrogen bonds.45Further, these interactions are found to be closed shell in nature. It is of interest to note that R ij andD e values for the O–H···O interactions follow the exponential decay trend (R 2=0.972) rather than linear correlation (R 2=0.844). The title complex also stabilized by three intermolecular C–H···O interactions. As can be seen from the table 3, the ρ (r) values for these interactions lie within the suggested limit of Koch-Popelier. However, only one interaction (C10–H10···O2) which is involving in the self-assembly of mandelate anions satisfying the suggested limit of the Laplacian.
In addition to N–H+···O/O-, O–H···O and C–H···O interactions, some of the motifs are additionally stabilized by intermolecular C–H···C(π), Csp 3–H···H–Csp 2 type dihydrogen bonding and Cπ···Olpinteractions. These three interactions are of closed shell in nature as revealed by the topological parameters. It should be noted that the Csp 3–H···H–Csp 2 type dihydrogen bonding interaction is found be to strongest based on the values of D e and H (r) as compared to C–H···C(π) interactions.