The X-ray crystal structure of a previously reported extremely strong quadruple NH•••N AAAA-DDDD hydrogen bond array [5•4] (Ka = 1.5 x 106 M-1 in CH3CN; Ka > 3 x 1012 M-1 in CH2Cl2) features four short linear hydrogen bonds. Changing the two benzimidazole groups of the DDDD unit to triazole groups replaces two of the NH•••N hydrogen bonds with CH•••N interactions (complex [5•6]), but only reduces the association constant in CH3CN by two orders of magnitude (Ka = 2.6 × 104 M-1 in CH3CN; Ka > 1 x 107 M-1 in CH2Cl2). Related complexes without the triazole groups range in Ka from 18-270 M-1 in CH3CN, suggesting that the CH•••N interactions can be considered part of a strong AAAA-DDDD quadruple hydrogen bonding array. The NH•••N/CH•••N AAAA-DDDD motif can be repeatedly switched 'on' and 'off' in CDCl3 through successive additions of acid and base.