Table 1.

Selected UV–vis spectroscopy, IR spectroscopy, and ESIMS data and their assignments for compounds 6–8. The data for the reference compounds (1–5, 9–11) have been included for comparison.

Compound	UV–vis ν1, ν2 [nm]	IR νas, νs(RCO2), ν(SH) [cm−1]	ESI [M+] m/z	Ref.
1 [Ni2L(Cl)](ClO4)	658, 1002	–, –, –	n.d.a	[43]
2 [Ni2L(HL2)](ClO4)	652, 1125	1599, 1408, 2550	937.2	[39]
3 [Ni2L(HL3)](ClO4)	650, 1122	1550, 1408, –	1089.4	[40]
4 [Ni2L(L2)Au(PPh3)](ClO4)	653, 1129	1587, 1403, –	1397.4	[39]
5 [Ni2L(L3)Au(Ph)](BPh4)	651, 1119	1552, 1437, –	1363.3	[39]
6 [Ni2L(HL4)](ClO4)	649, 1129	1596, 1407, 2547	932.39	this work
7 [Ni2L(HL5)](ClO4)	650, 1133	1581, 1423, 2547	1002.5	this work
8 [Ni2L(HL6)](ClO4)	650, 1118	1596, 1408, 2548	1013.37	this work
9 [Ni2L(O2CPh)](ClO4)	651, 1123	1569, 1407, –	n.d.a	[45]
10 [Ni2L(O2CCH3)](ClO4)	650, 1131	1588, 1428, –	n.d.a	[45]
11 [Ni2L(SPh)](ClO4)	667, 1141	–, –, –	n.d.a	[46]

^an.d. = not determined.