Text this: Synthesis and characterization of [4‐{(CH2O)2CH}C6H4]2Hg, [4‐(O=CH)C6H4]2Hg and [(E)‐4‐(RN=CH)C6H4]2Hg (R = 2′‐py, 4′‐py, 2′‐pyCH2, 4′‐pyCH2)